I'd go into petsmart and ask them to order you one. You won't have to pay shipping and if there was something wrong with it you'd be able to take it to the store and exchange it.. They deal with zoomed equipment.. We have a petculture here in PEI and they are wonderful to work with, every time I go in there they ask me if there is something they don't have but should, and if there is, the next week they have it lol
A screened enclosure is supper easy to make out of aluminum window screen frame, and you could make it cheaper and to the specs that you want