Make your own!
I recently converted an old fridge into a smoker and am almost ready to finally fire it up. I'm having difficulty getting the temperature low enough using a single propane burner from the side burner of a BBQ even with the knob set as low as possible. I need to install a needle valve to get it even lower as the insulation really keeps the heat in, but that's fine with me as the fridge will be very easy to maintain constant temperature while using very little propane. Smoking in the winter will be much easier with the insulated unit compared to the thin sheet smoker I used before....
Fridge with all steel interior - free
11 oven racks (do NOT use racks from a fridge!) - free
Burner, adjustment dial, hose and regulator from a scrapped BBQ - free
Galvanized sheet for chimney/damper - free scrap from HVAC guy
Paint for the exterior - free....the scrap metal from stripping the fridge covered the cost of a liter of tremclad
Two tubes of Permatex red RTV silicone gasket maker which is food safe - $20
Roll of aluminum sheet to cover large holes on the interior - $15
Needle valve - $10
20' length of 3/4 or 1" angle iron to hold racks - $12
For $50-60 I have a smoker that offers much more space while using less propane. Plus....it looks cool
I found with the small 3 rack unit I used before I was constantly cursing as it never held enough meat to do decent size batches or jerky, pepperettes or sausages.