Potty train your cat
It may sound — and look — a little ridiculous, but training your cat to use the toilet instead of a litter box can save you a lot of money. The average cost of litter for one cat is as high as $150 annually, according to PetCoach, and with the average lifespan of a domestic cat being 15 years, you're looking at a total litter expenditure of about $2,250.
Teaching your cat to use the toilet is a fairly simple process, and the cost of a kit is around $30. The only downside is that you can't teach a cat to flush.