A lot of offices are moving / closing often these days, you'll probably have a pretty good chance of finding something on craigslist. Another alternative just

A lot of offices are moving / closing often these days, you'll probably have a pretty good chance of finding something on craigslist. Another alternative just to throw it in there: The EQ3 Twist chair is interesting. Made out of bungy chords, it flexes but is extremely supportive. I got mine because I've never felt like sitting straight up automatically when getting into a chair, other than this one. It's not in the same realm as the Aeron, in fact it probably leaves funny rope patterns on your butt after awhile, but ergonomically, it's probably better to stand and move around once in awhile for circulation. At the office I sit on one of those super geek inflatable balls =( $25 and you get used to it after awhile. I also don't have a horrible back or anything, so take the above two options with a grain of salt! goodluck!