Petco offers discounted price when you bring your empty tub of their brand litter back. : r/ZeroWaste
Cat parents: Petco (and possibly Petsmart) lets you refill your old sophresh kitty litter tubs at a discounted price as opposed to buying another tub! : r/ZeroWaste
Naturally Fresh Multi-Cat Walnut Cat Litter - Natural | Sale Can't miss savings | PetSmart