Discount items in pairs on Shopify: every 2 items get X% off

Setup

How to set it up.

1. Add a Product percentage discount. Click Create campaign and choose Blank campaign, or open an existing campaign. In the Rules card, click Add rule and choose Product percentage discount as the action.
2. Keep Flat rate and choose Complete pairs. Leave the discount mode on Flat rate. Set Quantity application to "Complete pairs, highest-priced items first" and enter the percentage.
3. Choose which items can pair up. Under Discount applies to, pick All products, Selected items or Exclude items, by Collections, Products or Variants. Every item the rule covers counts toward the same pairs.
4. Set Combining rules. In the Combining rules card, set When other rules also match to Use only the best matching rule. The rule is rejected with any other setting.
5. Preview odd counts, then publish. Run Preview on an order with an odd number of eligible items at different prices, set the rule to Active, then open Publish and click Publish now.

Good to know

Where it stops.

• The group size is always two. "3 for X" or "buy 4, save more" offers need quantity tiers or Buy X Get Y instead.
• Complete pairs only works on a Product percentage discount with a flat rate. It cannot be used with a fixed amount off, with quantity tiers, or with a Variants matching metafield scope.
• Because the rule must use "Use only the best matching rule", it does not stack with other product discounts in the same campaign; only the one with the largest saving applies. Put other offers in a separate campaign and set Combinations.
• Claimed free gift lines never count toward a pair at checkout.

Plan: Free — up to 20 promotion orders a month; Starter — $49/month for unlimited orders. Compare plans →