yes, build your own!
I got a medium sized chest freezer and mounted a triple tower of perlicks on top for less than that!
I think mine will fit four cornies on the floor (I have 3 in it now) and I have a 10# CO2 with regulator on the hump inside.
I painted it racecar red and clearcoated it a ton. Then I learned you need special paint for appliances so it's all chipped up, but it WAS shiney!
freezer was $168 at lowes (go on craigs list and they are $50), tower and parts was about $300 to get perlicks and a tank and such. You might be able to ebay that cheaper.
With chest freezers, you can drill through the lid just fine. I bolted mine on by then drilling holes for mounting screws and replacing them with long thin bolds from lowes with very wide washers inside holding them in. It's awkward to pull out hte freezer far into the room and open the lid, but it works.