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Bestbuy has PNY – PowerPack 2600 USB Rechargeable External Battery – Black for $ 3.99 + Free Store Pickup
http://www.bestbuy.com/site/pny-p…Id=8679112
Also available via eBay:
http://www.ebay.com/itm/PNY-Power…SwX~dWq
Product Features
Compatible with most USB- and micro USB-chargeable devices
Including a wide variety of cell phones, tablets and MP3 players.