I've been lurking on some commercial restaurant auction sites and I've just noticed this thing called a refrigerated prep station. Looks like a great starting place for a kegerator build at a reasonable entry cost.
http://auction.mainauctionservices.com/cgi-bin/mnlist.cgi?mainauction13/1554/4
http://auction.mainauctionservices.com/cgi-bin/mnlist.cgi?mainauction13/1554/4