BalanceFrom via Amazon offers the CQ Wellness Breathable Coccyx Ortopedic Comfort Foam Seat Cushion in Gray or Navy for $27.95. Coupon code "DUZVOB2K" drops it to $22.95. Plus, Prime members bag free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise it costs $5.78.) That's $57 under list and the lowest total price we could find. It purports to assist with sciatica nerve pain, coccyx pain, and other lower back pains.