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Check out this T-mobile Universal Micro-USB Battery Boost Portable Charger, originally $39.95 is now $4.99 at Tanga. Shipping adds $2.99, but this is still the best price we found for this by at least $10. The Universal Micro-USB Battery Boost Portable Charger is compatible with any Micro-USB device. An LED display lets you know when your device is charging. Sales tax is charged in most states.