Dyna Glo Tag Along 4500-8000 BTU portable propane heater. It runs off 1 pound bottles or a 20 pound tank with an additional hose. I have used this in a blind and inside an RV. It is very similar to the Mr. Heater Buddy. Puts out great heat. $50 Located in Northern NJ. Send a PM if interested.
Those portable heaters can cause you some problems, to be honest. It is sometimes very beneficial to heat all around you, but there are moments when you really do not want this to happen and have no control over it. Either you freeze or you die from the heat. I have a solution for you that I discovered for myself a long time ago. Simply begin using heaters from Over Door Heaters | Air Curtains | BN Thermic. Portable heaters, in particular, are good because they can be used in a number of ways, from homes to markets, to heat the whole room or only a specific area. Because of its chemical properties, this material, ceramic, is incredible. I really hope that I have been of any assistance to you.