I have one that was brand new in the box, blue flame hanging unit. I opened it and couldnt get it to work, the guy who bought it said the propane wouldnt come through the line or something. It can probably be exchanged somewhere if you want it you can have it for $50.
Mr heater, 30,00 btu blue flame ventless heater.
http://ecx.images-amazon.com/images/I/51Bm0coIt%2BL.AA280.jpg