Update: Deal over.

Gaiam Balance Ball Chairs – Link

Today only, Amazon has these on sale for just $59.79 w/ free shipping.

• Created by leading health and fitness experts to improve your back health
• Employs the same balance ball used in your workout routine. Designed for users 5-feet to 5-feet, 11-inches tall; 300-pound weight capacity
• Helps build a healthier back, align the spine, relieve pain, and improve your overall well-being
• Includes removable 52-centimeter Balance Ball, an adjustable support bar, easy-glide casters, air pump
• Note: For optimal performance, it may be necessary to re-inflate your new Balance Ball once or twice after the initial inflation