Garberators are cheap (50 bucks).....An office frige kegerator is cheap (about 2 hundred)
If you have a garage fridgerator and want to take up one half of it, you can get two five gallon cornies in there and still have all the freezer, and room for cokes/milk/ect. with about half of the space you started with (if is a full size refridgerator). Only cost is your lines, CO2 bottle, shanks, regulator, and a hole saw.