Amazon offers the Gaiam Balance Ball Chair
in Cool Grey, model no. 610-6002RTL, for $67.10
with free shipping
. That's the lowest total price we could find by $6, although we saw it for $12 less a week ago. It features a 300-lb. weight capacity and includes a removable 52cm balance ball, adjustable support bar, easy-glide casters, and an air pump.