Two kinds
Steam sauna tents vs traditional saunas
Portable steam sauna tents
A fabric enclosure with a chair and a separate steam generator that fills the tent with 100 percent humidity at 100 to 120 F. Your head stays outside, it runs on a standard outlet, reaches temperature in 5 to 10 minutes and folds flat. The lowest-cost way to sweat at home: Durasage from $119, SaunaBox SmartSteam from $299.
Traditional saunas
A wood cabin with an electric heater holding stones. Dry heat at 150 to 190 F, and a ladle of water on the stones for bursts of steam, the Finnish way. Medical Sauna Traditional 5 (2 person, $4,999), Traditional 6 (3 person, $9,199) and Traditional 7 (4 person, $12,199), Canadian hemlock, 220 V 30 A, 3-year warranty.
If you searched for a steam sauna meaning a steam room (a tiled, sealed room with a steam generator), neither of these is that; the tents are the closest home equivalent.