computer chair (Littleton, CO)

Hey Gang,
I'm in need of a computer chair. The hydraulics on my last second-hand chair have finally gone kaput and it sinks every time it's raised (it's also fairly torn up by my Sister's cat).
If you have a small-medium sized computer chair that's in fairly good shape and with working hydraulics that you don't need, please drop me a line. I'd be happy to come and get it.
Thanks!