Great price on a Johnson Controls A419ABC-1C Electronic Temp Controller
I just recently made the commitment to start kegging after 2.5 years of brewing. I got a good deal on a chest freezer through Craigslist (7 cu. ft. for $50 - in great shape!), and now have to buy all of the other stuff - temp controller and obviously the kegging system itself.
I found what I believe to be a great deal on the Johnson A419 digital temperature controller - $59 through Amazon with $8.95 shipping. It's about $20 less than Northern Brewer and Midwest Supplies!
Looks like it doesn't come with power cords. The ones from NB come prewired and ready to plug in. You could save a little with the Amazon unit, even having to buy some power cord - just depends on how much the time to wire it up is worth to you.