I have a blue Sparco Sprint seat for sale. I bought it off craigslist a while ago and have used it occasionally as a computer chair. The seat was new when I bought it and is still just about perfect. I'll try to throw up some pictures when I get a chance.
This thing is super light and awesome but I don't use it for it's intended purpose and it takes up space.
I'd like $100. The new ones MSRP for $369.