I was talking with a restaurant owner recently and he mentioned that he had a freezer in storage that he wasn't using;
Needs some work but I was happy to see that a Sanke keg fits along with 3 Cornies. It will probably hold six Cornies if I needed it and the price was right (gratis)
I plan on hooking it up to a watt meter to see how efficient it is.
I already tested to confirm it can freeze.
Now all I need to do is hook up a temp controller.
Reading over the forums my favourate options are a Ranco (simplicity)or Arduino (tech head)