Petco has their P.A.L.S program, and PetSmart has a PetPerks card. Both of these cards are free; all you have to do is sign up at a local store. It’s like having a Kroger Plus card, really. Both programs will send you coupons and online offers, but the most useful thing about the card in the in store discounts you receive. Swiping this card can take several dollars off your purchase. These deals are not only limited to tanks and accessories, but are offered on fish as well.