You have to sign up for a DG coupon account. Load the coupon to your account and then you can purchase gift cards at DG. If I recall, when you check out you enter your email and it adds the coupon. A year ago I did this to purchase my WSF when they offered 15% off. I was able to purchase (2) $500 gift cards at different stores by using 2 separate email address. The max you can load on a card is $500. I was able to apply the gift cards to my online purchase along with my military credit and ended up getting 25%.