Earlier quoted context omitted.
That's the (more or less starting) price of a high-end Herman Miller chair like an Aeron or Embody. Which is simultaneously a lot of money and a very reasonable purchase for something you spend a lot of time in if you can afford it.
I cannot recommend an Aeron chair enough. It is worth it. I'm sitting in one right now, the one I picked up for a song in 2001 after the dot com bust from (ironically enough) a liquidated startup. It has lasted me that long.
For obscure chairs - you can sometimes get a roaring good deal by just setting up alerts on Craigslist. It's how we got a Hag Capisco for $350 instead of paying nearly $900 - good as new too.