How it works
You select a collection, choose whether to target the cheapest or most expensive item, and set a discount percentage. When a customer adds items from that collection to their cart, the app automatically identifies the qualifying item and applies the discount to it — and only it.
The rest of the items in the cart stay at full price. This creates a targeted incentive that encourages specific shopping behavior: discounting the most expensive item pushes customers toward premium products, while discounting the cheapest item encourages adding one more thing to the cart.
⭐ Example: "20% Off Your Most Expensive Item"
You want to encourage customers to splurge on your premium pieces. You set up a 20% discount on the most expensive item from your "Designer Edit" collection:
✓ Only the leather jacket gets discounted (it's the most expensive). The customer saved $70 — and they chose the premium item because the discount made it more accessible.
⭐ Example: "30% Off Your Cheapest Item"
You want to encourage customers to add one more item to their cart. A discount on the cheapest item makes that easy:
✓ The hair clip set is the cheapest item, so it gets 30% off. The customer was on the fence about adding it — the discount sealed the deal.
Real-world use cases
💎 Splurge Incentive (Most Expensive)
15% off the most expensive item in your luxury collection. Customers who might hesitate on a $300 piece are more willing when they save $45. The discount specifically targets the big-ticket item.
🧴 Sample Incentive (Cheapest)
50% off the cheapest item in the skincare collection. Customers add a travel-size or sample product knowing it'll be deeply discounted, then discover a new favorite.
👔 Outfit Completion (Cheapest)
25% off the cheapest item when buying from the menswear collection. Encourages adding a tie, pocket square, or socks to round out a purchase.
🎁 Treat Yourself (Most Expensive)
20% off the most expensive item during a "Treat Yourself" event. Frames the discount as permission to go for the item they really want.
Setting it up takes 2 minutes
Select "Discount on Select Item"
Choose this promotion type from the new promotion screen.
Pick your collection
Select which collection this promotion applies to.
Choose cheapest or most expensive
Decide which item gets the discount — the lowest-priced or highest-priced item in the cart from that collection.
Set the discount percentage
Enter how much off the selected item receives (e.g., 20%).
Activate
Save and go live. The discount targets the right item automatically at checkout.
Cheapest vs. most expensive — when to use which
Discount the most expensive item when you want to encourage customers to go premium. This works best with collections that have a wide price range, where the discount on the highest-priced item represents significant savings. It shifts customer behavior toward higher-value purchases.
Discount the cheapest item when you want to increase units per transaction. This works best when you have lower-priced add-on items (accessories, samples, basics) that customers might skip without an incentive. The discount gives them a reason to grab one more thing.
Frequently asked questions
Custom Promos can automatically apply a percentage off either the cheapest or the most expensive qualifying item in the collection — for example 20% off your most expensive item — with no code for the customer to enter.
Yes. You decide during setup whether the discount targets the lowest-priced or highest-priced qualifying item in the cart.
Not in a flexible, automatic way tied to a collection. Custom Promos handles the selection logic inside checkout so the right item is discounted every time.
No. Custom Promos applies the discount automatically at checkout based on what's in the cart. There's no code for customers to remember, type, or get wrong — they simply see the savings as they shop.
Your discount codes work normally when no Custom Promos promotion is active. When a Custom Promos promotion is running, discount codes can't be stacked on top of it — this is intentional, to stop customers from combining a promotion with a separate coupon and discounting more than you planned.
Custom Promos runs on Shopify Functions, which are available on all standard Shopify plans. You don't need Shopify Plus.
Most promotions take under two minutes. You pick the promotion type, choose your collection with a visual picker, set your numbers, and activate. No code, no collection IDs, no developer.
Ready to target specific items with smart discounts?
Cheapest or most expensive — you choose, the app handles the rest.
Get Started — $24/mo →Explore other promotion types
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💰 Spend Threshold Bonus
Spend $150+ get 15% off the collection
🎯 Buy X, Get Y for Flat Price
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🎁 Buy X, Get Y Free
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🏪 Multi-Collection Sale
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🏷️ Storewide Sale with Exclusions
Everything 50% off, except Clearance