Groupon offers the uNu Apple-Certified DX Protective Battery Case for iPhone 5 in Matte Black or Glossy White for $49.99 with free shipping. That's the lowest total price we could find for this case in any color by $30. The 2,300mAh battery purports to provide up to a 100% battery boost and features a microUSB port. Deal ends July 13 at 1 am ET.