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Get this OXA 10,000 mAh Dual USB Portable External Battery Power Bank for $18.99 plus free shipping at Newegg via Easierbuy. Comparable chargers of this capacity are at least $14 more. This can charge two devices at once, such as smart phones and tablets, and can charge a single device as many as an estimated 10 times (may vary per device). It also has a built-in LED flashlight. There is no sales tax (except in CA, NJ, TN).