As one of its daily deals, Tanga offers the OtterBox Defender Case with Holster for iPhone 4 / 4S in Gray or Black, model no. 77-18581, for $17.99 with free shipping. That's tied with our expired mention from five days ago as the lowest total price we could find for any color by $6. It features a clear protective membrane for the touchscreen plus openings for the camera lens, dock connector port, and home button. Deal ends August 27 at 10 am ET.