Designer Living offers the Sleep Philosophy Lexi Memory Foam Cuddler in four colors for $16.99 plus $5.95 for shipping. That's $18 off and the lowest total price we could find. It measures 14x18" and features a non-skid bottom.
It's also available in 21x27" for $33.99 or 24x36" for $50.99 with the above shipping. They're $36 and $54 off, respectively.