Originally $99, Gaiam's Balance Ball Chair with Pump is now on sale for $79.98. Better yet, use code AFSHP6 to get free shipping. The BalanceBall Chair was developed by a chiropractic pioneer who sought to create a chair that would help to strengthen core muscles and improve spinal alignment. The chair comes complete with a removable 52cm BalanceBall, pump, adjustable support bar, and easy-glide, lockable, castor wheels. There is no sales tax (except CA, CO, OH).