Tanga offers the OtterBox Defender Case with Holster for iPhone 4 / 4S in Black, model no. 77-18581, or Gray, model no. 77-18579, for $17.99 with free shipping. That's tied with our mention from last week and the lowest total price we could find by $9. It features a clear protective membrane for the touchscreen plus openings for the camera lens, dock connector port, and home button.