I buy Dr. Elsey’s cat litter from Petco when it’s on sale, usually the 40 lb bag. It’s heavy, but it lasts forever in my two-cat home. The clumping stays strong even after a full week. I’ve tried cheaper clay litters, and none compare. When you’re already budgeting for good food like Nature’s Domain, it’s worth having a litter that doesn’t fall apart and create more mess.