All4Cellular offers the Ventev VersaDUO Interchangeable Shell for iPhone 4 / 4S for $1.95. Coupon code "A4C6A7" drops it to $1.85. With $2 for shipping, that's tied with our mention from a month ago and a buck under the lowest total price we could find for this case elsewhere. It includes three interchangeable color plates in red, blue, and silver. Deal ends December 7.