Brian, Check E-Bay. Type in "tents, canopies" there are about 2000 listed now. Thats where I got ours, It wasn't an auction item, it was Buy it Now, It was inexpensive, has all walls, and as proved this weekend, doesn't leak. The Co is in Fla and has every size, color, material. I wish that I could remember their name. The 10 X 20 I bought was about $200 and I think that it will last about 3 or 4 years.
Joe