Free: Contests & Raffles.
I own one but haven't used it much. Figured it might be good to have if the power goes out so I can charge a phone. The grill attachment they make for it is real cool
The tin can, and this stove are a "rocket" type stove that does a hotter cleaner job of burning because of the way it focuses air draw and fuel. it directs theheat to where you need it. Rocket type stoves can be built out of nearly any material, dirt, brick, tin cans, pipe, etc. all of those do a better job than a trational fire.