I have 11 cats, all but 2 are indoor-outdoor but they go out less in the winter. In the summer they’re more likely to shit as soon as they come in than go outside. The litter boxes are 30”x20”x16” storage totes and I go through 3 17lb boxes of the lightweight stuff per box per week. I’ve tried less expensive stuff like pine/cedar, corn, and newspaper, it all pretty much sucks. The regular clumping litter costs $10 for a 35-40lb box, so about 1/4 the price per pound of lightweight, but I end up with a trash bag I can barely lift every 3-4 days. Plus there’s the $120/week for litter. I guess I’ll go back to the heavyweight clumping for now while I search.
I live 70 miles from the nearest Walmart and Sam’s & BJ’s are even farther. Chewy is woke as fuck, so is Petco so fuck them both. I generally fill the back of my Jeep with litter and food when I go to the vet (also 70 miles away) to get prescription urinary tract food every 3 weeks. Gas mileage on the drive home sucks more than usual with an extra 5-600lb or so, but the weight has come in handy going over the mountains in snow LOL