"Like" World's Best Cat Litter on Facebook to score a coupon for $2 off any 17lb. or 34 lb. bag of World's Best Cat Litter, any formula. World's Best Cat Litter is made from all natural corn, is super clumping, and comes in three different formulas to best suit your needs. I have used the Multi-Cat Clumping formula before, and have loved it. Be sure to grab your coupon today! World's Best Cat Litter can be found at several stores, including PetSmart, Petco, and Target.