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Get this Mophie Juice Pack Pro Outdoor Edition Ruggedized Rechargeable External Battery Case for iPhone 4/4S for $84.99 with free shipping at Newegg. That's the best price we could find for one by $60. This case is not only capable of of fully recharging your phone with its 2,500 mAh battery, but it also offers multi-layer impact protection. There is no sales tax (except in CA, NJ, TN).