Petco has a coupon for a Free 4-5 lb bag of Nutro dry dog food on their site; you must be a Petco PALS member to use.  I used it at my local Petsmart (they take competitor coupons) since it’s closer and I’m lazy.  You’ll need a PetSmart PetPerk loyalty card.  PetSupplies Ltd used to take competitor coupons; haven’t shopped there in quite some time and their site sucks donkey balls.

Since it’s a store coupon, I paid no sales tax.