Recently ordered the scoopfree automatic litter box because I am tired of scooping clay litter. After the first crystal tray that it comes with I am going to buy a reusable tray and was thinking of buying vibrant brand crystal litter instead of there's. Vibrant is Walmarts brand and is approx 13.00 for 8lbs or around 7.00 for 4lbs. Does anyone know if that is a good deal and if it will work with the machine to scoop the litter correctly. Also, I will take other brand advice for good priced crystal cat litter because I am new to this kind of litter. Lastly, does anyone mind sharing their thoughts on crystal litter because I have read it is not good for the planet. Thanks.