I just got an enclosed cat litter box from Zooplus.co.uk called the Gimpett. Wanted to mention as its FAB! No smells, hardly any litter splurted out when the cats come out of it, and lots of room. I think Im going to have to replace all the other trays/boxes I have with these too. It cost £16.99. Worth a look if you are in the UK and wondering what tray/box to get.