Cat litter generally costs around 20-50 yuan per bag, but prices vary for different types. The more common ones on the market now are pine wood sand, crystal sand, and bentonite sand. The price is about 20 to 50 yuan per bag. One bag weighs ten kilograms and can be used by a cat for more than a month. The slightly more expensive one is tofu cat litter, which costs about 50 yuan. Of course, some well-known brands of cat litter will be more expensive.