Groupon offers the Aduro U-Band Sport Armband for iPhone, in five colors, model no. AI5-RF01-ARM, for $9.99 plus $2 for shipping. That's the lowest total price we could find by $8. (We saw the Android phone version for the same price last month.) Sales tax is added where applicable. It's adjustable and reflective and features a hidden key pocket. This armband fits iPhone 4, 4S, and 5, as well as the iPod touch. Deal ends February 22.