There is a chair company called Steelcase.
they make great, long lasting chairs in a wide range styles and pricing.
you can buy new but there are also alot on the used market. here is one on
ebay..
in my area (silicon valley) there are a couple of large warehouse type places that buy out complete businesses when they go under.. they buy all the desks and the chairs and lots of other stuff. then they resale to the public for a fraction of new. i picked up a 600 steelcase chair for a hundred bucks out the door and its perfect for lab work. and it looks and feels like new.
i found that company on
craigslist.
good luck.
ps. herman miller also makes some great chairs.