If you do a search for "Stool" on that site, there are a bunch of options.
They have four different versions of the old high school shop class stools: with and without the back, in a couple different heights, and as short as 18 inches.
I remember hating those when I was a kid, but damn they sure were durable.
And probably not THAT uncomfortable. Never have to work about welding and grinder sparks either.
Thoughts?
-Brad