Hulislem via Amazon offers the Cylen Home Ventilated Memory Foam Orthopedic Seat Cushion in Blue for $26.97. Coupon code "44GIGPN4" drops it to $13.75. With free shipping, that's a buck below our mention from last month and the lowest price we've seen. (It's the best deal now by $18.) It features memory foam with an activated charcoal-infused bamboo core, an anti-slip bottom, removable washable cover, and carry handle.