I went around all the restaurant supply stores on Shanghai street to find a fridge that would fit 1 (or maybe 2) corny kegs, plus the CO2. Almost impossible.... either too huge, or just a tad bit to small, or way too expensive. (You could always have one custom made )
I ended up getting me a used household fridge (one with the freezer compartment on top) from some used fridge street stall in Shek Kip Mei. Had to put the faucet on the door, but it works fine... and it was only HKD900.