I have a rolling office chair that I no longer need. I believe it's about 15 years old. The air piston doesn't work with my weight anymore (about 235 lbs), but otherwise it's in pretty good shape. It has a dark blue fabric cover, arm rests, and tilts back and forth.
Free to whomever wants it. I can sent pictures via email if you like. You pick up here in Millers Falls.