Bestbuy offers Chirp - Wheel+ for Back Pain Relief - 3 Pack - Mint for $59.99 (orig. $99.99) with free shipping.

Product Description:
The Chirp Wheel+ helps reduce back pain by decompressing your spine, strengthening core muscles, and massaging out tight trigger points. Made with a rigid ABS plastic core and soft EVA compression sensitive mat, the Chirp Wheel+ can support up to 500 pounds! Three wheel sizes provide different levels of pressure for customizable back pain relief. The smallest wheel offers the most pressure, to target specific muscle knots, while the largest wheel offers the least pressure and the greatest stretch to help correct poor posture. 

• Includes 3 Sizes
  The Chirp Wheel+ 3-Pack includes a 6" Deep Tissue wheel, a 10" Firm wheel and a 12" Gentle wheel.
• Offers Back Pain Relief
  The Chirp Wheel+ helps reduce back pain by massaging the muscles along your spine, correcting poor posture, and decompressing your vertebrae. The spinal canal, a small groove in the center of the wheel, provides a 4-way stretch and protects you from unsafe spinal pressure.
• Built Strong
  Each wheel has an injection molded, rigid core that was tested to support up to 500 pounds! The Chirp Wheels are also built with a soft EVA compression sensitive mat so rolling out is comfortable.
• Strengthens Muscles while Improving Posture
  Rolling out on the Chirp Wheel+ will help improve the natural curvature of the spine. Incorporating the Chirp Wheel+ into your daily routine will help strengthen the muscles surrounding your spine and may help relieve pain from disc issues.
• Reduces Muscle Strain
  The wheels come in three different sizes for customizable back pain relief. Each helps to stretch and massage your back muscles while elongating your spine. The smallest wheel offers the most pressure while the largest wheel offers the least pressure and the greatest stretch.
• Easy to Use
  Anyone can use the Chirp Wheel+. Use the wheel on the ground, against the wall, or in a chair. The ergonomic shape of the wheel will help reduce back pain and correct poor posture however you use it.