Meet my new friend, Herman Miller..
About a year and a half ago, I went to an auction that had a bunch of Herman Miller Aereon Chairs. They are the famous mesh chair of the dot.com era, and they went cheap - I think $200 or so for what is normally a $400-$600 chair. Not realizing what they were, and also not having room for them in my truck, I passed, and have been kicking myself ever since.
So when I stumbled on the chair above at the auction I was at in the middle of nowhere in PA, I was pretty thrilled, because I noticed it had a "Herman Miller" sticker on the bottom. Nobody else seemed to know what it was - I ended up getting it for $13 (it was part of a group of stuff and I bid to "choose" it). It's not an Areon, and it's missing a caster, and has a very small stain on the seat, but for $13, I still think it's a hell of a deal - it looks like it's normally a $370 chair (it has the optional "flexnet" seat, plus casters).
Now I just need to find a caster.