I lucked out (maybe) a few years ago where I ran across a random craigslist ad where a guy had about 75 new rolling/adjustable height simple stools (black round padded vinyl, 4 chromed legs, halfway decent casters) from some sort of large medical/hospital project that got canned....I bought two of them, maybe $30? maybe $25?. Medical equipment stuff should be good, right?
somewhere in the world, I own a basic HF type shorter rolling stool w/ tray. I think a friend ended up absorbing it into his shop & ultimately I didn't care because I found that it was often prone to tipping over and I'd grown to hate it.