Amazon.com: Gaiam 610-6002RTL Balance Ball Chair - Classic Yoga Ball Chair with 52cm Stability Ball, Pump & Exercise Guide for Home or Office, Black : Sports & Outdoors
Yoga Ball Office Chair
Classic Balance Ball Chair Exercise Stability Yoga Ball Premium Ergonomic Chair for Home and Office Desk with Air Pump, Exercise Guide and Satisfaction Guarantee - Newegg.com
Is Using an Exercise Ball for an Office Chair a Good Idea? - Integrated Health & Injury Center