Buy X, Get Y for Flat Price on Shopify — Collection Sale + Flat Price Item

How it works

You select a collection, set a base discount percentage, and define a flat price for the cheapest item. When a customer adds items from that collection, every item gets the base discount. Then the cheapest item in their cart automatically drops to the flat price you set — like $10 or $5.

This creates a compelling "add one more" incentive. If a customer is already browsing a 50% off sale, knowing the cheapest item will be just $10 gives them a reason to grab that extra accessory, basic tee, or impulse buy.

🎯 Example: "50% Off Summer Collection, Cheapest Item Just $10"

Your summer collection is 50% off. To push multi-item purchases, you set the cheapest item to a flat $10. A customer adding 3 items sees this:

🛒 Shopping Cart — Summer Collection · 50% OFF + Cheapest Item $10

Linen Sundress$110.00$55.00

Straw Tote Bag$75.00$37.50

Cotton Tank Top$35.00$10.00 FLAT PRICE!

Total$220.00 $102.50

✓ The first two items are 50% off. The cheapest item (Cotton Tank Top) dropped from $35 to just $10. Total savings: $117.50.

Real-world use cases

👜 Accessory Add-On

40% off clothing, cheapest item just $5. Customers add a scarf, belt, or jewelry piece knowing it'll basically be free. Great for increasing units per transaction.

🧪 Try Something New

25% off skincare, cheapest item just $10. Encourages customers to add a sample-size or lower-cost product they haven't tried before.

🎉 Birthday Sale

30% off everything in the birthday collection, cheapest item just $1. Makes for a great "grab bag" deal that gets people excited.

👫 Bring a Friend

20% off, cheapest item just $15. Market it as "buy something for yourself, grab a gift for a friend at a flat price."

Setting it up takes 2 minutes

Select "Buy X, Get Y for Flat Price"

Choose this promotion type from the new promotion screen.

Pick your collection

Select which collection this promotion applies to.

Set the base discount

Enter the percentage off for all items (e.g., 50%).

Set the flat price

Enter the dollar amount the cheapest item should drop to (e.g., $10). Preview shows the exact calculation.

Activate

Save and go live. The flat price deal applies automatically at checkout.

The psychology behind this promotion

Flat-price deals are incredibly effective because they create a clear, tangible value proposition. "Cheapest item just $10" is easy to understand and instantly compelling. Customers don't have to do mental math — they know exactly what they're getting.

This is especially powerful when combined with a base percentage discount. The customer is already in a buying mindset from the sale. The flat-price item feels like a bonus on top of an already great deal, making it almost impossible to resist adding one more item to the cart.

Ready to run a flat-price promotion?

Collection sale + cheapest item at a flat price. Set up in under 2 minutes.

Get Started — $24/mo →

Collection on sale — cheapest item drops to a flat price