Volume discounts are one of the most direct ways to increase average order value on Shopify. The mechanic is simple: per-unit price drops as quantity increases, and customers are motivated to round up their order to unlock the next tier. The challenge is that Shopify's native tools offer no volume discount or quantity break functionality on bundles. Getting tiered pricing that drops per-unit cost as quantity increases requires a dedicated Shopify volume discount app.
This guide covers 7 of the best Shopify bundle apps with volume discounts, compared on quantity break mechanics, widget placements, discount tier depth, cart-level mechanics, Shopify Functions compatibility, and pricing. The apps in this guide surface specifically for the volume discounts category on the Shopify App Store, meaning they are purpose-built for this use case rather than general bundle apps that happen to include quantity breaks as a secondary feature. Whether you want a quantity break setup with three widget placements, a cart progress bar that auto-gifts at spend milestones, AI-driven offer selection, or A/B testing of discount tiers at $9.99/month, there is a specific option here. For the broader strategy framing, the guide on tiered pricing and discount deals pairs well with the app evaluation below.
Apps are ranked with Easy Bundle Builder at #1 as the best Shopify bundle app with volume discounts in this guide. The remaining six follow with feature breakdowns, pricing, pros, cons, and ratings.
Comparison Table of Shopify Bundle Apps with Volume Discounts
| App |
Volume Discount Features |
Supporting Features |
Rating & Reviews |
Pricing |
⭐ RECOMMENDED Easy Bundle Builder |
Quantity breaks (per-unit drop as quantity rises) |
Percentage off, flat $, BXGY, BOGO, BYOB bundles |
4.9 ★ 876 reviews |
Free up to $500/mo Paid plans available |
| Fast Bundle |
Quantity breaks and volume discounts |
Percentage off, flat $, fixed bundle pricing |
5.0 ★ 2,572 reviews |
Starts at $19/mo |
| AOV.ai Bundles Upsell |
Quantity breaks and tiered pricing |
Tiered pricing, cart upsells |
5.0 ★ 1,322 reviews |
Free plan available |
| Koala Bundles Volume Discounts |
Quantity breaks (per product or collection) |
BOGO, BXGY, % off, fixed bundles |
4.9 ★ 710 reviews |
Starts at $12.99/mo |
| Dealeasy |
Volume discounts via Shopify Functions |
Percentage off, flat $, cart upsells |
4.9 ★ 550 reviews |
Free + paid tiers |
Detailed App Reviews: Top Shopify Bundle Apps with Volume Discounts
1. Easy Bundle Builder (Best Overall)
Overview
Easy Bundle Builder is a Shopify bundle app with volume discounts that covers every discount type in the category, with quantity breaks as a fully developed feature set rather than a single-tier afterthought. It carries 876 reviews at a 4.9 rating and Built for Shopify certification, and it is best suited for stores that want quantity break widgets at multiple points in the buyer journey, tiered percentage discounts on bundles, and subscription recurring discounts in one tool. Pricing starts at $49/month with a 15-day free trial on all paid plans, using a revenue-based model tied to bundle sales. The differentiator is the combination of three quantity break widget placements and add-on step quantity scaling that no other Shopify volume discount app replicates.
Why Easy Bundle Builder is the Best Shopify Bundle App with Volume Discounts
Most apps in this category surface volume discounts in a single product-page widget. Easy Bundle Builder surfaces the same incentive at three points in the buyer journey, which means customers see the next quantity break when they land on the product, while they build the bundle, and once they reach the cart. The add-on step quantity scaling adds a second layer: the more main products a customer selects, the deeper the discount on the add-on, turning quantity into a layered reward. Subscription merchants get a recurring discount that applies to every renewal order rather than only the first, which converts a one-time bundle sale into ongoing LTV.
Key Features
- Quantity Breaks: Per-unit price drops as quantity increases, the core mechanic of any Shopify bundle app with volume discounts.
- Three Widget Placements: Quantity break tiers display on the product page, inside the bundle builder, and in the cart savings panel.
- Tiered Percentage Discounts: Multi-tier rules where discount depth increases with quantity (e.g., buy 2 get 10%, buy 3 get 15%, buy 5 get 20%).
- Fixed Bundle Price Tiers: Set a specific price for a defined quantity (e.g., any 3 for $29.99); functions as a volume incentive.
- Add-On Step Quantity Scaling: Discount on the add-on step deepens based on how many main bundle products the customer selects, a layered Shopify volume discount app mechanic.
- Buy X Get Y (BXGY) and BOGO: Trigger a free or discounted item when a qualifying quantity is reached.
- Percentage and Flat Dollar Off: Both formats configurable across BYOB, mix-and-match, and pre-curated bundles.
- Subscription Recurring Discounts: Applies to all repeat subscription orders, not just the first; integrates with Loop, Appstle Subscriptions, and Subi.
- Promo Code Stacking: Bundle discounts combine with Shopify promo codes via a toggle in Additional Configuration > Bundle Settings.
- Cart Transformation API: Bundle items appear as individual line items at checkout, preserving inventory accuracy and discount code compatibility. For background, see the guide on migrating from Shopify Scripts to Shopify Functions.
- BYOB and Mix and Match: Customers select their own product mix; quantity break tiers apply across the mix, the BYOB pattern of any modern Shopify bundle app with volume discounts.
- Gift Box Builder and Subscription Box: Branded presentation for gift sets and recurring bundle delivery.
- Klaviyo Integration: Bundle-specific email flows triggered by purchase events (Plus plan).
- Bundle Analytics: Revenue, AOV, and conversion tracking across bundle types and discount configurations.
Pricing
- Starter: Free, up to $500/month in bundle sales
- Essential: $49/month, up to $5,000/month in bundle sales
- Plus: $149/month, up to $20,000/month in bundle sales
- Enterprise: $399/month, up to $75,000/month in bundle sales
- 15-day free trial on all paid plans
Pros
- Three quantity break widget placements: customers see the volume incentive at every stage of the buyer journey, not only on the product page.
- Add-on step quantity scaling: discount on the add-on deepens as the customer adds main products, a layered volume mechanic not found in competing apps.
- Subscription recurring discount on every order: applies to all repeat orders, converting a one-time bundle sale into LTV.
- Cart Transformation API: bundle items as individual line items mean accurate inventory and full Shopify discount code compatibility.
- Promo code stacking via toggle: bundle discounts combine with Shopify promo codes, confirmed via the Combine with order discounts setting.
- Six discount types in one app: percentage, flat dollar, fixed bundle price, BXGY, add-on step, and subscription recurring covered in a single tool.
- 15-day free trial: longer than most paid options in this guide.
Cons
- Entry pricing at $49/month: higher than most competitors in this guide, but offset by a free plan for stores under $500/month in bundle revenue and the breadth of discount type coverage in a single app.
Rating
⭐ 4.9 (876 reviews) - Shopify App Store
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2. Fast Bundle
Overview
Fast Bundle is a Shopify bundle app with volume discounts that combines quantity breaks across all bundle types with AI-generated bundle imagery and AI-driven product pairing. It is best suited for stores that want a Shopify volume discount app paired with image generation and FBT recommendations to reduce manual setup. Pricing starts at $19/month with a 7-day free trial, using a revenue-capped model with the top tier at $299/month for unlimited bundle sales.
Key Features
- Quantity Breaks and Volume Discounts: A core mechanic for any Shopify bundle app with volume discounts; available across all bundle formats.
- Tiered Discounts: Multi-level rules configurable per bundle or product, a standard configuration in any Shopify volume discount app.
- AI Bundle Image Generator: Auto-generates lifestyle product imagery for bundle pages.
- AI-Powered Frequently Bought Together: AI-driven product recommendations rather than manual pairing.
- Discount Type Coverage: Percentage off, flat dollar off, fixed bundle price, BXGY, BOGO, free shipping, free gift / auto-add.
- Bundle Type Coverage: BYOB, Mix and Match, Fixed bundles, Multipacks, Gift Box Builder, Subscription Box.
- Subscription Integrations: Recurpay and Subi; Recharge is not listed as a supported subscription integration.
- Page Builder and Cart Drawer Integrations: GemPages, PageFly, and UpCart.
- Shopify POS: Bundle discounts work in physical retail environments.
- Multilingual Storefront: 10 storefront languages.
Pricing
- Standard 1K: $19/month, up to $1,000/month in bundle revenue
- Standard 3K: $49/month, up to $3,000/month in bundle revenue
- Standard 10K: $139/month, up to $10,000/month in bundle revenue
- Enterprise: $299/month, unlimited bundle revenue
- 7-day free trial on paid plans
Pros
- 2,572 reviews at 5.0: a deep review base on the Shopify App Store.
- AI-generated bundle imagery: removes a design step for stores launching new bundles.
- AI-Powered Frequently Bought Together: recommendations adjust to product affinity rather than manual pairing.
- Free shipping and auto-add gift: both included as discount triggers.
- Page builder integrations: GemPages and PageFly supported for custom bundle layouts.
Cons
- Top tier pricing at $299/month: highest top-tier in this guide for stores past $10,000/month in bundle revenue.
- Promo code stacking with Shopify discounts not confirmed: behavior should be tested before high-traffic events.
- 7-day free trial: shortest trial in this guide.
Rating
⭐ 5.0 (2,572 reviews) - Shopify App Store
3. AOV.ai Bundles Upsell
Overview
AOV.ai Bundles Upsell is a free Shopify bundle app with volume discounts that runs on Shopify Functions and Cart Transforms for server-side discount processing. It is best suited for stores that want quantity break tiers, AI-driven offer presentation, and wholesale-app compatibility without a monthly fee. The differentiator is its session-level offer logic, which adjusts the displayed volume discount based on the customer's behavior in real time.
Key Features
- Quantity Breaks and Tiered Pricing: A core mechanic for any Shopify bundle app with volume discounts; configurable per product or collection.
- Shopify Functions Native: Discounts are processed server-side, future-proof past the Shopify Scripts EOL of June 30, 2026.
- AI-Powered Offer Presentation: Surfaces the most relevant volume discount per customer session, rather than a static tier table common to most Shopify volume discount apps.
- Volume Discount Widget: Placed on the product page; font, color, and CSS customizable via the support team at no additional cost.
- Wholesale App Compatibility: Supports a no-discount bundle option so a third-party wholesale pricing app can handle discount logic.
- AI-Powered Frequently Bought Together: Recommends complementary products as a bundle add-on at the product page or cart.
- Bundle Type Coverage: Fixed bundles, multipacks, Mix and Match, Variant bundles, and Build-a-Box (BYOB).
- Multilingual Storefront: 10 languages including Spanish, French, German, Portuguese, Dutch, Italian, Vietnamese, Hindi, Japanese, English.
Pricing
- Free: unlimited campaigns, unlimited revenue, no order caps
Pros
- No paid tiers: unlimited revenue and orders at $0/month.
- Server-side discount processing: Shopify Functions and Cart Transforms confirmed in app permissions.
- Wholesale app compatibility: runs alongside third-party wholesale pricing apps via the no-discount bundle option.
- Session-level offer logic: the displayed offer adjusts to customer behavior in real time.
- Multilingual: 10 storefront languages out of the box.
Cons
- BOGO and free gift not included: stores wanting both volume discounts and BOGO need a second app to cover the gap.
- No subscription app integrations listed: stores running Recharge, Loop, or Skio will not find native compatibility.
- Widget styling requires support intervention: font, color, and CSS changes go through the support team rather than a self-serve interface.
Rating
⭐ 5.0 (1,322 reviews) - Shopify App Store
4. Koala Bundles Volume Discounts
Overview
Koala Bundles Volume Discounts is a Shopify bundle app with volume discounts that is best known for a quantity mechanic with no upper ceiling. It is best suited for bulk-adjacent product categories (supplements, pet supplies, beauty, consumables) where customers routinely want to buy more than the highest preset tier. Pricing runs from $12.99/month to $59.99/month based on bundle revenue, with all features available on every plan tier.
Key Features
- Quantity Breaks: Tiered pricing that drops per-unit cost as quantity increases, the central mechanic of this Shopify bundle app with volume discounts.
- No Quantity Ceiling: Customers can purchase above the highest configured tier and still receive the maximum discount automatically.
- Cart Volume Discounts: Discount triggers based on total cart quantity thresholds, separate from per-product quantity breaks.
- Tiered Pricing Formats: Percentage, flat dollar, and fixed price options per tier of the Shopify volume discount app configuration.
- Segment Targeting: Different volume discount offers can be shown to specific customer segments.
- Announcement Bar and Countdown Timers: Native urgency mechanics on product pages and cart, no separate app required.
- Post-Purchase One-Click Upsell: Built into the app natively rather than via a separate integration.
- Bundle Type Coverage: Fixed bundles, Mix and Match, Variant bundles, Infinite Option bundles, Wholesale, FBT, Custom bundles, and Digital products.
- Page Builder and Cart Drawer Integrations: GemPages, PageFly, and UpCart.
- All Features on All Plans: Plan tiers differ only by monthly bundle revenue cap, not by feature gating.
Pricing
- Tier 1: $12.99/month, up to $1,000/month in bundle revenue
- Tier 2: $24.99/month, mid-range revenue cap
- Tier 3: $39.99/month, higher revenue cap
- Tier 4: $59.99/month, unlimited bundle revenue
- 14-day free trial on all paid plans
Pros
- No quantity ceiling: customers above the highest tier still receive the maximum discount, preventing lost sales for bulk buyers.
- Post-purchase upsell built in: extends AOV beyond the initial bundle session without a second app.
- All features on every plan: no feature gating between $12.99/month and $59.99/month.
- Native countdown timers and announcement bar: urgency mechanics included in the app.
- 14-day free trial: longer than most apps in this guide.
Cons
- No SKU-level variant tracking per bundle component: confirmed limitation in reviews.
- Top-tier pricing at $59.99/month: required for unlimited revenue, mid-range vs. competitors.
- No POS support: bundles do not sync to in-store point-of-sale terminals.
Rating
⭐ 4.9 (710 reviews) - Shopify App Store
5. Dealeasy
Overview
Dealeasy is a Shopify bundle app with volume discounts that is built natively on Shopify Functions, with discount stacking across volume, product, order, and shipping discounts at the same checkout. It is best suited for stores where the cart progress bar is the primary AOV driver and where reliable discount stacking is required for high-traffic events. Pricing runs from $8.99/month to $24.99/month based on total store orders, with a 30-day free trial.
Key Features
- Volume Discounts via Shopify Functions: Server-side processing with confirmed simultaneous stacking of volume, product, order, and shipping discounts.
- Cart Progress Bar: Visual milestone-based bar showing customers how close they are to the next discount tier, free shipping, or free gift.
- Progressive Free Gifts: Free gift automatically added to cart when a spend milestone is reached, no manual claim required.
- Quantity Breaks: Tiered volume pricing configurable per product or collection on this Shopify volume discount app.
- Tiered Discounts: Multi-level discount structures configurable per campaign, a standard pattern for any Shopify bundle app with volume discounts.
- Discount Type Coverage: Percentage off, flat dollar off, fixed price, BXGY, BOGO, free shipping, free gift auto-add.
- Wholesale and Bulk Pricing: Available as a discount structure for B2B segments.
- Mix and Match with Fixed Price: Customers select from a defined product pool; fixed price applied to the mix.
- Selleasy Integration: Native integration with the Selleasy upsell app.
- Zoom Support Calls: Scheduled video calls included on all pricing tiers.
Pricing
- Freemium Tier I: Free, up to 50 total store orders/month, all features included
- Freemium Tier II: $8.99/month, up to 500 total store orders/month
- Freemium Tier III: $16.99/month, up to 1,000 total store orders/month
- Freemium Tier IV: $24.99/month, 1,000+ total store orders/month
- 30-day free trial on all paid plans
Pros
- Discount stacking confirmed: volume, product, order, and shipping discounts can stack simultaneously via Shopify Functions.
- Cart progress bar with auto-gift add: visual spend-goal mechanic with progressive free gift triggers.
- Top-tier pricing capped at $24.99/month: lowest maximum price among paid options in this guide.
- 30-day free trial: longest trial in this guide.
- Zoom support calls included: scheduled video calls included at all pricing tiers.
Cons
- Order-count pricing model: stores with high total order volume but low Dealeasy-driven order share pay disproportionately.
- Narrow bundle type breadth: no BYOB or Gift Box Builder, only Mix and Match and Fixed bundles.
- No subscription app integrations documented: stores running Recharge, Loop, or Skio bundles will not find native compatibility.
Rating
⭐ 4.9 (550 reviews) - Shopify App Store
6. Avis Bundles Volume Discounts
Overview
Avis Bundles Volume Discounts is a free Shopify bundle app with volume discounts focused on quantity breaks, tiered pricing, wholesale pricing, and bulk discounts. It is best suited for small to mid-size stores that want a Shopify volume discount app at no cost with multiple widget layout options. The app is fully free with no plan tiers, no revenue caps, and no feature gating, and it carries Built for Shopify certification with 71 reviews at a 4.9 rating.
Key Features
- Quantity Breaks: A core mechanic of this Shopify bundle app with volume discounts; works with both Add to Cart and Buy Now buttons.
- Tiered Pricing: Multiple price levels by quantity, configurable per product or collection.
- Wholesale and Bulk Pricing: Wholesale tier pricing as a native discount type.
- Volume Discount Widget Layouts: Multiple layouts available; style, color, and placement customizable via the support team.
- Discount Stacking: Listed in the Shopify taxonomy for the app; configurable per campaign.
- Discount Type Coverage: Percentage off, flat dollar off, cart discounts, and upsell discounts on this Shopify volume discount app.
- Bundle Type Coverage: Fixed bundles, Multipacks, Variant bundles, Sample packs, Wholesale bundles, Upsell bundles, Digital products.
- Automations: Listed in the discount management taxonomy for the app.
Pricing
- Free: unlimited revenue, no order caps, no feature gating
Pros
- No paid tiers: unlimited revenue and orders at $0/month.
- Built for Shopify certification: verifies platform compatibility and basic performance benchmarks.
- Add to Cart and Buy Now button support: quantity break logic applies on both buyer flows.
- Multiple widget layout options: style and placement customization available via the support team.
- Active developer engagement: 24-hour response time on custom feature requests reported in reviews.
Cons
- No BOGO, BXGY, free gifts, free shipping, or subscription discounts: scope is limited to volume and quantity-based mechanics.
- No mix-and-match or BYOB bundle types: stores wanting customer-built bundles need a different app.
- 71 reviews: smallest review base in this guide; not yet battle-tested at high merchant volume.
- English-only interface: no other storefront languages available.
Rating
⭐ 4.9 (71 reviews) - Shopify App Store
7. Volume Discounts & Bundle Apps
Overview
Volume Discounts & Bundle Apps is a Shopify bundle app with volume discounts that includes A/B testing on its $9.99/month tier and a free plan that combines volume discounts with a free gift in a single campaign. It is best suited for budget-conscious stores that want to actively test discount tier structures or run a single proof-of-concept campaign at no cost. The app holds a 5.0 rating across 69 reviews with Built for Shopify certification.
Key Features
- Quantity Breaks and Tiered Pricing: Unlimited tiers on the paid plan, configurable per product, collection, or tag, the core function of this Shopify bundle app with volume discounts.
- Volume Discount with Free Gift: Available on both the free plan and the paid plan as a combined campaign.
- BOGO within Quantity Breaks: Combined mechanic that applies buy-one-get-one logic as part of a tiered quantity offer.
- Cart Volume Discounts: Threshold-based discount triggers at the cart level, separate from product-page tiers.
- Countdown Timers: Native urgency mechanic for volume discount campaigns.
- A/B Testing: Built into the $9.99/month plan for testing discount tier structures, an uncommon feature in a budget Shopify volume discount app. For test design context, see the guide on Shopify A/B testing.
- Discount Type Coverage: BOGO, BXGY, percentage off, flat dollar off, fixed price, bulk pricing, wholesale pricing, cart discounts.
- Currency Conversion: Listed as a discount management feature.
- Subscription App Integration: Available on the paid plan; specific subscription app not named in the listing.
- Eleven Bundle Types: Fixed, Multipacks, Mix and Match, Variant, Infinite Option, BYOB, Wholesale, Upsell, Cross-sell, FBT, and Custom bundles.
Pricing
- Free: 1 campaign limit, includes volume discount + free gift combination
- Plus: $9.99/month, unlimited campaigns, A/B testing, no revenue or order caps
Pros
- A/B testing at $9.99/month: built into the paid plan for testing discount tier structures.
- Free gift + volume discount on the free tier: combined mechanic available at $0/month for proof-of-concept testing.
- BOGO within Quantity Breaks: combined mechanic not offered by other apps in this guide.
- Eleven bundle types: broad bundle format coverage on a single app.
- Flat $9.99/month at scale: no revenue or order caps on the paid plan.
Cons
- Free plan limited to 1 campaign: restrictive for multi-product stores.
- Shopify Functions compatibility not confirmed: discount processing method unclear, should be tested before high-traffic events.
- Thin integration list: only Checkout and Shopify Admin appear in Works With.
- No POS support: bundles do not sync to in-store point-of-sale terminals.
Rating
⭐ 5.0 (69 reviews) - Shopify App Store
How to Choose the Right Shopify Bundle App with Volume Discounts
Volume discount apps differ more than their feature lists suggest. The same quantity break mechanic can be implemented via theme injection, Shopify Scripts (EOL June 30, 2026), or Shopify Functions, and the behavior at checkout differs significantly across each. Here is what to evaluate beyond the feature checklist.
- Match the mechanic to the product category: Quantity breaks on the product page work best for consumables, supplements, pet supplies, and beauty products where customers naturally buy in multiples. Spend-goal cart progress bars work better for mixed-category stores where no single product drives volume purchases but a cart total threshold motivates the customer to add more.
- Verify Shopify Functions compatibility before a high-traffic event: AOV.ai and Dealeasy are the two apps in this guide with confirmed Shopify Functions and Cart Transforms implementation. If reliable discount stacking is required at BFCM or during a flash sale, verify how the app processes discounts in the app admin before going live.
- Test the no-quantity-ceiling behavior: Most apps cap purchases at the highest configured tier. Koala Bundles is the only app in this guide that lets customers buy above the highest preset tier and still receive the maximum discount. For wholesale-adjacent stores where customers routinely want 20 units when only tiers up to 10 are configured, this distinction matters.
- Check whether volume discounts are on the free plan: AOV.ai and Avis Bundles are fully free with no caps. Volume Discounts & Bundle Apps covers 1 campaign free. For early-stage stores, test the mechanics on a free plan and validate conversion impact before committing to a paid tier.
- Model pricing at the 12-month projected order or revenue volume, not the current one: Revenue-capped apps are affordable at low volume but expensive at scale. Order-count-based apps can feel disproportionate when total store order volume is high but app-driven orders are a small fraction. Flat-rate and free apps remove pricing variability entirely.
Can You Offer Volume Discounts on Bundles Without an App on Shopify?
Short answer: No, not beyond the most basic fixed bundle pricing.
What Shopify Does Without an App
- Shopify's native Bundles app supports two configurations: fixed bundles (pre-defined product groups) and multipacks (multiple units of the same product).
- Fixed bundles can be sold at a set price lower than the sum of individual item prices.
- Inventory tracking works across Online Store, Shop, and Shopify POS.
What You Cannot Do Without a Shopify Bundle App with Volume Discounts
- Apply tiered quantity pricing (buy more, save more) where the per-unit discount increases at each quantity threshold.
- Show a quantity break table on the product page that updates dynamically as customers select quantities.
- Display a cart progress bar tied to volume-based spend-goal thresholds.
- Apply Buy X Get Y logic where the bonus item auto-adds to the cart.
- Run subscription-compatible bundles (Shopify's documentation explicitly states bundles cannot be sold with selling plans such as subscriptions).
- A/B test different discount tier structures against each other.
- Auto-add a free gift when a spend-goal milestone is reached.
Shopify's native Bundles app currently holds a 2.7-star rating across 561 reviews. The most common complaints are no mix-and-match, no volume discounts, and no subscription compatibility.
Conclusion
This guide reviewed 7 Shopify bundle apps with volume discounts: Easy Bundle Builder, Fast Bundle, AOV.ai Bundles Upsell, Koala Bundles Volume Discounts, Dealeasy, Avis Bundles Volume Discounts, and Volume Discounts & Bundle Apps. Each takes a distinct approach to volume pricing, and the right choice depends on which mechanic matters most for a given store.
Easy Bundle Builder is the best Shopify bundle app with volume discounts in this guide for stores that want every volume mechanic in a single tool: three quantity break widget placements, add-on step quantity scaling, subscription recurring discounts on every order, promo code stacking via toggle, and the Cart Transformation API for accurate inventory and discount code compatibility. For Shopify Functions-native processing at no cost with AI-driven offer selection, AOV.ai is a strong free alternative. For the no-ceiling quantity mechanic, Koala Bundles is the only option in this guide with that behavior. For cart progress bar mechanics with auto-gift add and reliable discount stacking, Dealeasy is the strongest fit on those specific dimensions. For budget testing of discount tier structures, Volume Discounts & Bundle Apps offers A/B testing at $9.99/month.
Two apps in this guide are completely free with no caps: AOV.ai (1,322 reviews) and Avis Bundles (71 reviews). Both are worth testing before committing to a paid tier, particularly for stores validating volume discount mechanics for the first time.