everblue_tech via eBay offers the Mophie Juice Pack Plus 2,000mAh Charging Case for iPhone 4 / 4s in Pink for $19.99 with free shipping. That's tied with our mention from a month ago and the lowest total price we could find by $48. This 2,000mAh battery pack provides up to eight hours of talk time or up to seven hours on the Internet.