Gaiam.com offers the BalanceBall Chair in Charcoal for $78.98. Apply coupon code "CWIN9" to drop it to $63.18. With $9.99 for shipping, that ties our mention from a week ago as the lowest total price we've seen by $4. This exercise ball chair includes a removable 52cm Balance Ball, adjustable support bar, easy-glide casters, air pump, and more.