All4Cellular offers the OtterBox Defender Holster for iPhone 4S in Black for $3.95. Coupon code "OTTER5" cuts it to $3.75. With free shipping, that beats our April mention by a buck and is the lowest total price we could find today by $2. This holster works in conjunction with OtterBox cases and features a ratcheting swivel. Coupon expires August 6.