Biodegradable litter packaged specifically for cats tends to be more expensive than traditional clay litters, so cost is often not a positive factor in their selection. However, one of these, namely pine pellets can be purchased from regional feed stores that normally carry bags for horse bedding at a significant cost reduction, often cheaper than the cheapest clumping litter. Most biodegradable litters last longer than the equivalent size of clay or clumping clay litters. Grain-based animal or poultry feed also provides an economical alternative to products marketed specifically as cat litter Also, most of these forms of litter are recycled from human usage and are thus reusing a waste product as opposed to drawing clay from mines.