Temp controller for fridge

I just got a free, used, half size referigerator from a gentleman down the street who was replacing the one in his motor home. I want to get a temperature controller for it. Would this be something that I could pick up at Lowe's or Home Depot, or is it more of a specialty item I would need to get from Homebrew supply shop? Exactly what is it I need to ask for, and what is a resonable price?

Any help would be appreciated.

For a fridge I would put a thermometer in and play with the temp knob until you get it where you want it.

I just got an analog unit for an old fridge I picked up. Today's the first day it went into action actually. I got one made by Johnson Controls, I believe. You can see it online at Northern brewer or Midwest Supplies. It cost me $58, but I didn't have to pay shipping. It's a nice little unit.

Thanks, for the respnses.
It is much appreciated.