This deal has ended.
SmartBargains has this Visco 1.25" Memory Foam Pad for only $35.19 after this 12% off coupon for new customers (returnees can get free shipping with $75) valid through 6/1. All bed sizes are available at this price. Thicker pads (up to 4") are available as well, but this is the most affordable. Shipping is $8.95 and there is no tax (except MA, KY, NC).