After 6 years, my Vintage Keeper 220 cooling unit burned out on me. It wasn't very old but it did suffer through 5 moves - Toronto to Florida, 3 moves in Florida and then up to NYC - so I guess it's had some stress.
I checked around and found a replacement unit at http://www.wineracking.com. 888-274-8813. A nice woman from Mississauga took my order and dispatched a replacement unit from a warehouse in Phoenix. It arrived in NYC 3 days later. The unit fit perfectly and works great.
For those of you with a VK220, the model name was NUVO and serial #CN106360-136. I have one of the newer VK220s with the larger opening in the back. If you have an older unit, you may have to cut a larger opening. Template comes with the unit to guide you.
I think the unit cost about $270 plus shipping.