Here is a thermostat that is recommended on a budget.
http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
I would also recommend checking out the follow post
http://ball-pythons.net/forums/showt...ius)-Caresheet
http://ball-pythons.net/forums/showt...t-Thermometers
I would also recommended giving your ball more time to settle in, I would say give it a couple weeks and/or 3 or 4 meals before holding.