Configuring Advanced Coupons For Specific Products and Quantity Minimums
How can I create a coupon to apply only to customers who purchase a minimum number of a particular product?
The best method would be to Create a new coupon by navigating to Coupons / New. For Coupon Application choose only the product you would like to discount. For Coupon Threshold select the dollar amount that corresponds to cost of the minimum number of products allowed. This coupon will then be able to be applied to that product only after the customer has added the correct number of items to their cart.