You can get a horse water bin at any feed and tack store. They are usually about 50 cents a gallon for the metal ones. If you do not live in a rural area, look online at
http://www.statelinetack.com/slt/mai...=1160403476120 or any other horse tack supply place. What do you need that for a nesting/digging box? Or for a swim tank- make sure you put a warmer in the water with that much and remember they poo a lot in their water, and it may be hard to clean at that size without a plug in it. You may look at a bathtub for a swim tank and just plug and unplug it.
Add shelves for thermal variation and hiding places. The more natural and hot, the better for Niles. Good luck.
Trina
OMNIherp, LLC