Had a few minutes and saw this forum so thought I'd make a quick post. Here's a pocket rocket fired sauna I made from salvaged materials. Have ~$100 in to it. Very happy with how it all performs and have enjoyed it immensely. The following is a copy & paste from the youtube video:
"This sauna was built almost entirely from salvaged materials. The only things purchased new: Two stove pipe elbows, silicone, and some screws. It's an old grain hopper that was headed to the scrap yard. Its roof was missing so I turned it upside down and capped the auger hole with a domed skylight I made from plexiglass. Each cedar shake was tapered with a carving ax. Time consuming! The benches and walls are from a redwood deck and the ceiling is cedar and redwood fencing. The floor bears on 4" of locally harvested cinders for insulation. The stove is 4 pieces of scrap metal (no bottom- it sits on the cinders), the top being a disk from a farm disk I welded on concave side up... a built-in pot to melt snow for humidity and add essential oils to. There's a damper in the chimney but the stove has no moving parts. Starts super easy and burns hot and clean. The ring surrounding the stove and containing the rocks, is the middle third of a 50 gallon barrel."