All4Cellular offers the Trident Kraken A.M.S. Case with Holster for Apple iPhone 4 / 4S, model no. AMS-IPH4S-BK, for $8.95. Coupon code "FALL10" drops it to $8.05. With free shipping, that's a buck below our mention from two days ago and the lowest total price we could find by $1. (Most vendors charge $11 or more.) It features a silicone core, hard polycarbonate exterior, and built-in screen protector. Deal ends October 7.