Petsmart has on their website a Mail in Rebate form for a $25 PetSmart Gift Card WYB $25 or more of Exquisicat Cat Litter. You can also find these near the cat litter in form of a tear pad.

Currently they have the scoopable 40lb litter on sale for $12.99 each.   Buy 2, then submit for the $25 Petsmart Gift Card.  Your final price is $0.98 after the Petsmart Gift Card.

There is a limit of 2 per household, but you have to submit each Rebate form in a seperate envelope with all the required paperwork.  That means, you could potentially get up to 160lbs. of cat litter for as low as $1.96 after the (2) $25.00 Petsmart Gift Cards.   Valid until 8/21/2011