Check restaurant equipment suppliers in the yellow pages or internet by you. Also, I would look into used restuarant, store & bar equipment on internet (Craigs List, etc). You can check at local corner store and ask where the get the coolers and who services them, and then call that person & on up the chain.
You dont care if it runs or not, so you should be able to get one alot cheaper. You just need to find one.
Also, you could take an old refrigerator and cut a hole in the door and add a window if you have to have one.
Good luck.