Energizer PowerSleeve For iPhone 4 $30
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Newegg has this Energizer PowerSleeve Silicon Cse & rechargeable Battery For iPhone 4 for $29.99 with free shipping. Amazon has price matched, but otherwise this is the best price by $8. This case doubles as a backup battery for your phone, nearly doubling the battery life of the phone. Sales tax is only charged in CA, NJ, and TN.
This Vantec Power Cube 5200 mAh Power Bank drop from the sale price of $19.99 to $12.99 plus free shipping at Newegg when you use coupon code AFNJ4028 during checkout. This was the lowest price we found by $17. It has two ports for charging USB-based devices and can charge each item simultaneously. There is no sales tax (except in CA, NJ, TN). (Instructions »)