In general, when I was using footstools, I found the metal ones to be far more adjustable than the "prettier" wooden ones. If you want to stick with a footstool, you'll find lots of brands even on Amazon.
There are so many other non-footstool supports than Dynarette cushions by far; search the forum for them. It's pretty much a matter of what suits you best physically. I personally love the DeOro, but there's lots of supports, and lots of opinions, out there. You may have to try a few!
Try this link as well, in this forum: viewtopic.php?t=31238