Primo Super-store via Amazon offers its Prime members the EyeCandis 2,200mAh Battery Case for Apple iPhone 5 in Black, model no. iBC5-2200, for $11.99 with free shipping. (Non-members can spend $25 or more; otherwise shipping adds $5.40.) That's $2 under the lowest total price we could find for a similar case elsewhere. Sales tax is added where applicable. It extends the iPhone 5 standby time by up to 300 hours and talk time up to seven hours.