The petstore only sells rheostats. I haven't put the UTH under the tank yet and my grandmother said that when she walked into my room last night, the temperature was possibly up in the 80s, which is what I want. She cut my space heater off, since she didn't know that my snake had to be kept warm. I've turned it back on and lets see if the temps go back up like that. If they do, I won't need the UTH.