All4Cellular offers this Retro 80s Case for iPhone
in Black for $9.79
with free shipping
. (BestDealUSA via Amazon
has it for pennies more.) That's $3 below our May mention and the lowest total price we could find by a buck. This case fits the iPhone 3, 3G, 4, and 4S, and can also be used as a vertical and horizontal stand.
Update: The price at BestDealUSA via Amazon has since slipped to $9.06.