I scored a 37 inch Ultima Pro Triple Door Folding crate for $79 and change and free shipping! This is the newer version of the crate we had for Caleb when he was a puppy. I loved it, except that it wasn't tall enough for him as an adult. The "Pro" model is taller. Owen has to be crated when we aren't home, and the wire crate I have now is too big to keep up all the time. Because this one has a side door, I can put it in the corner where the hermit crab is (my plan is to put a piece of plywood on top, cover the three sides with a shower curtain, and put the hermit crab on the crate).
http://www.midwestpetproducts.com/midwestdogcrates/ultima-dog-crate/midwest-ultima-pro-triple-door-folding-dog-crate-all-sizes
http://www.midwestpetproducts.com/midwestdogcrates/ultima-dog-crate/midwest-ultima-pro-triple-door-folding-dog-crate-all-sizes