[lbotos]

If you are in a major city you can often find used "high-end" chairs for reasonable price. I'm on a 5-year-old used Aeron I got for $275. Herman Miller has made newer fancier chairs but I'll ride this one for probably a decade before I upgrade.

[macNchz]

I think now is likely a great time to be looking for one as well, as there's going to be a lot of flux as companies figure out what's next in terms of office space. My home office Aeron came to me for free recently when a friend's company moved out of their office space and gave lots of stuff away.

[nosmokewhereiam]

Used Herman Miller chairs are my favorite answer to this question.

[drcongo]

They are the best answer to this question. While I'm waiting to move house and have a dedicated working space, I'm currently working in an Eames recliner with the laptop on my lap. While somewhat unconventional, I've actually had way fewer back and neck problems in the last year than when I used to sit at a desk in an office. Once I've moved house though, it'll be a used Herman Miller, probably an Aeron.

[etrautmann]

I found commercially-resold Aerons in NYC for ~$400, which seems quite common (and quite reasonable) about a year ago.