Third time I've posted this tonight...

To keep it simple, cheap, and easy to take care of, I'd just use (for a hatchling) a shoebox sized tub, a used buttercup with an entrance cut as a hide, and paper or paper towels for substrate. Then a little Flexwatt for heating because it's SO much cheaper than a UTH. This inexpensive digital thermostat. And the Accurite unit w/probe. Also some small water bowl that is hopefully difficult to tip. I'm using an ashtray right now.

This works great even if you plan to move them up to a glass tank one day. I don't think they ever really need more than a 20gal. And they seem to do much better when they're obnoxiously crowded into a space, rather than when they have room to move around. (better=eating)