Free is the best route, accept mine..that was bad. Just be sure to set the compressor delay on whatever thermostat you use to its maximum, which I believe is 3 minutes on the model I linked. This just keeps the compressor from kicking on too many times too close together (there's a word for that, but I never graduated High School and I've been drinking) which will burn it out quickly. Ask me how I know...
Also, if you're truly interested in brewing good beer pick up a copy of
How to Brew by John Palmer. There is a plethora of good information in there. I also found it helpful to make a batch before I read it so I could learn from my own mistakes since I don't seem to learn very well from other peoples mistakes lol