everblue_tech via eBay offers the Mophie Juice Pack Plus 2,000mAh Charging Case for iPhone 4 / 4s in five colors (White pictured) for $18.49 with free shipping. That's $2 under our September mention and the lowest total price we could find now by a buck. This 2,000mAh battery pack provides up to eight hours of talk time or up to seven hours on the Internet.