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Tanga [tanga.com] has a deal for a myCharge Hub 3000 mAh Power Bank – $ 9.99 + $ 1.99 Shipping (so $ 11.98 Shipped).
[tanga.com] Thanks MelSquires

Info from product page:

• Compatible with Lightning and Micro-USB devices
• Rechargeable 3000 mAh battery
• Built-in USB port
• Charges 3 devices simultaneously
• Extra 13 hours of talk time
• Hassle free packaging