The cat litter I use for Coconut and Matrix is plain ole wood pellets for pellet stoves. It comes in a 40lb bag and runs about $5.00. Some mfg are now labeling their package for the use with cats because it keeps the ammonia smell down. I have been using this for over 6 years and it's great! I never smell the box and it's all natural.
This was another great item that Dr. Celeste Yarnall turned me on to.
http://www.celestialpets.comAll you need is about 3 - 4 inches in the litter box. When the cats use it, it fluffs up and absorbs all the urine. Just empty it every 2 - 3 days. You will not believe how long a 40lb bags lasts and how much money you save!
If the bag says "hard wood" do not use it. It will not absorb.
Kevin.