With temperature controllers I would suggest that you find one that can run off 110V AC (WortMonger hinted at this). Less junk = lighter headache.
Search eBay, there are a number of PID and gated controllers for sale on the cheap. You can find spec sheets for them with a quick google search. You should also consider your uses and the sensor's thermocouple compatability.
For example: I recently purchased 3 cheapo PID temperature controllers that can operate on 6 different thermocouples. They came with K-types, which are accurate over a HUGE (0-1100 C) range, but can accept the more applicable T-type, which will offer a more granular accuracy for brewing purposes because it's accurate between -185-300 C.