Looks like a new chair is on sale for $200($399 + tax for a new one).
Very strong and robust and ready for pick-up.
It is on sale because the kneeling pad size is a little bit smaller than my shin size.
My height is 5'10" and body weight is 195 lb, so please consider your body size before you contact me.
Prefer selling it to a person living in Palo Alto, Menlo Park area.

FYI, the below is the weblink of this product if you want to buy a new one.
http://www.amazon.com/gp/product/B008LAKLN2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1