Ebay offers Open-Box Herman Miller Aeron Size B Office Chair with Adjustable Lumbar Support  for $534.11 (reg $979) with free shipping.

Product Description:
Award-winning industrial designers Bill Stumpf and Don Chadwick earned themselves a place in what amounts to the design hall of fame when their Aeron Chair (1994) was added to the permanent collection of MoMA. This chair is the paradigm of ergonomic seating, conceived to conform not only to different body shapes but also to movement, with multiple adjustment points for a custom fit. The breakthrough Kinemat tilt mechanism lets it move smoothly with the user from forward tilt (when you reach for the phone) to backward recline (while you contemplate what to say). And the Pellicle weave upholstery, another innovation in concept and comfort, evenly distributes weight over the seat and back, and permits air circulation. Durable and sleek, this chair will still look like new long after you retire. Design doesn’t get more civilized. Constructed of 66% recycled materials. Backed by Madison Seating's 10 year warranty Only

• FREE Armrest Upgrade, Fully Adjustable Arms
• Size B
• Adjustable  Lumbar
• Black   With Graphite Frame
• Tension Control
• Height Adjustment
•  Forward Tilt 
•  Rear Tilt Locks
• 10 Year Warranty with Madison Seating Only