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DrHotDeal selling via Buy.com offers this iPhone 4/3G(s)/iPod Power Station Backup Battery w/ Power Indicator (1000 mAh), listed at $29.99, for $6.99 with free shipping. That is the best price we could find by $7. This device, charged from any USB port with your iPhone/iPod cable, can add battery life to your iPhone/iPod when the power is out or you can't charge normally. It has a slim design for portability. Sales tax is not charged in most states.