The small cardboard litter boxes are very popular for shelters and pet Best Cat Litter Boxes stores, and some cat breeders, but they are not very practical for long-term use for your pet cat. They are good for travel, however, and you should think about keeping a spare one or two around for special situations, like a stray cat coming into your life.Basic Plastic Pan Litter BoxThis design works just fine, as millions of people use them. They are fairly inexpensive and can be found in many stores. They can be purchased in many sizes and shapes, and some even have rims shaped to keep the litter in the pan. Make sure the one you choose is easy to scrub clean.