Mota Extended Battery Case for iPhone 4/4S for $29 + free shipping
Groupon offers the Mota Extended Battery Case for Apple iPhone 4 / 4S in five colors for $29 with free shipping. That's the lowest total price we could find by $16. This hard case features a built-in battery that almost doubles the battery life of iPhone 4/4S and extends talk time by up to seven hours. Deal ends January 23.
3 very similar deals were also reported by some other sources: