You ideally want something like these listed below as it is much easier to maintain humidity and clean. You can check craigslist cause I have seen boaphile and vision on my local ads for a pretty good price. All you really need is a 36x15x15(roughly) or better.
http://www.boaphileplastics.com/421d.html
http://www.npicages.com/36_stackable_cage.html
http://www.lllreptile.com/products/5...00-vision-cage