I get at least 2 or 3 hits per day on my blog Googling the term "firm stool." A while back, after a trip to Mexico, I openly discussed being in search of a firm stool, and apparently I'm not the only one.
I'm pretty sure I can help. For those of you finding my blog* by searching the term "firm stool," here are two links that may help:
*I show up 5th on the list out of 2,600,000 results. Wow...