ZooGue offers its ZooGue Social Shell Case for Apple iPhone 4S in 10 colors for $14.99. Coupon code "FreeZooGueAccessory" makes it one cent. With $3.98 for shipping, that's tied with our April mention and the lowest total price we could find now by $9.

Of note, you can buy two of these cases for $29.98 before coupon, two cents after. With $5.97 for shipping, that's $3/case, tied with our April mention, and the best per-unit price we've seen.