You can find large sterilite type tubs for very cheaply. We found some that measure roughly 4' long, 2' wide and 18" tall at Costco for $8.00USD. I believe I've seen similar tubs at Walmart or K-mart (especially right now because they're trying to sell storage containers for everyone's holiday decorations.) They are clear so you don't have to worry about upsetting anyone's photoperiod or rigging up special lighting.
I'd think that would work well for temporary housing. We actually use ours for semi-permanent home for our large BRB. We use heat tape on a rheostat to provide a good temp gradient and it also holds humidity well.
1.1 BCI, 1.1 BRB, 0.1 Amazon Basin ETB