Herman Miller is a big deal in the world of ergonomic office chairs, and the Aeron is an absolute classic. It's been reduced by 25% to $956.25 at Herman Miller for a couple of weeks now, so I don't expect the sale to hang around for much longer after Cyber Monday.
And it happens to be my favourite office chair of all time. It tops my list of the best office chairs for back pain for good reason. It really is a design icon, and it's supremely comfortable. Many have tried to copy it, without success.