I buy a junior face cord locally and it’s a mix of birch and oak. I wish it was seasoned a little bit longer.

The wood that sweat tent sells will burn very nicely and you wont be disappointed.

I purchased wood in bulk locally and was able to get a half cord of a variety of kiln dried wood (all good for firewood) cut to my preferred size. This was a significantly less expensive option for me. Definitely recommend buying in bulk if you have the option and storage space, especially if you plan to use the sauna more than once per week.