Per Purchase vs. Per Transaction These two words can cause a lot of confusion for shoppers. Per Purchase means that you can use one coupon per item purchased as long as the requirements are met on the coupon. So if you have a coupon that says save $1.00 off 1 bottle of juice limit 1 coupon per purchase and you are purchasing 5 bottles then you can use (5) $1.00 off 1 coupons in that View Post