I built mine out of a chest freezer that I picked up at Sams club for $130. I can fit 4 cornys in it and I control temp with an external thermostat. I built a wooden collar between the lid and the freezer and the taps come out of it. Right now I have three taps on it with room for one more. Altogether I think I have about $250 wrapped up in it. It was easy to build in a weekend.
"A Chief Petty Officer does not drink. But if he drinks, he will not get drunk. And if he gets drunk he will not stumble. And if he stumbles he will not fall. But if he falls, he will fall with his service stripes down, so that passers by think him to be a Junior Officer."