One of my clients recently showed me a great litter box and told me he got it from Home Depot. It was a spacious open box, longer than most I've seen.
What makes a great litter box?
Large Size - The bigger, the better! The box should be a minimum of 1 1/2 times of the length of your cat. For most cats that's going to be the largest make of a commercial litter box. Even then, if you have a long cat, it might be too small. Cats like to go inside the box, walk around, find a good spot. They need extra space to do this.
Uncovered - Most cats prefer uncovered boxes. In a multi-cat home, uncovered boxes may be essential to prevent ambush situations. Uncovered boxes also allow for good ventilation. Also, when we see what's going on there, we're more likely to take better care of it. Get rid of the top! Do you have a small and covered box? Imagine using an airplane bathroom all the time - that's what your cats experience is like.
Affordable - It's always nice when the box isn't expensive especially since it should be replaced when it gets all scratched up, about every 6 months to one year.
Home Depot hits all the marks. They don't actually make a "litter box", but they do sell concrete "mixing tubs" that can be used as litter boxes. A medium sized box (L 28 in. D x 20 in. W x 6 in) is larger than most commercial litter boxes and costs $7.98. Compare that to the cheapest adult litter box on Chewy which is too small (19 x 15 x 7.5 inches) and costs $8.19.
One of the biggest (24 x 18 x 10 inches) open boxes on *Chewy is Frisco's High Sided Litter box and cost $18.32. I have 3 of these Frisco boxes. The benefit of the Frisco box is the higher sides. If you've got a cat that does a lot of digging and kicks out litter, then the Home Depot box may not be the right fit. Though, if you have a senior cat or a cat with mobility issues, the lower side box may be great for your cat as it's easy to access.
Another good option for large boxes is an under the bed storage container. Target has an affordable option that is quite large 526 1/8" x 15 1/2" x 5 5/8 and costs $15.
Cats prefer large boxes and there are lots of good options outside of the pet store that may not only meet your cat's needs, but are better priced.
*Cat Advocate is an affiliate of Chewy which means if you click on the affiliate link and purchase, Cat Advocate receives a small commission at no extra cost to you.