Update: Newegg deal is sold out, but Amazon still has it available for $33. Still a great deal.
Amazon is offering a RAVPower 10400mAh external power bank for $28 with free shipping when you enter coupon code 9NZ84NWW at checkout. That is a total savings of $42 off retail, $12 from the average selling price and the lowest we have ever seen by $6. This massive portable battery pack has enough juice to charge an iPhone four to five times, a Samsung Galaxy three times, and an iPad at least once. You can expect to get over 500 recharge cycles over the lifetime of this device. The RAVPower power bank is perfect for camping, travel, or preparation for power outages during the summer storm season. Buy with confidence, nearly 400 Amazon reviewers rate it 4.5 stars.
Update: As one of their daily Shell Shocker deals, Newegg now has the RAVPower Dynamo-On-the-Go Black 10400 mAh (RP-PB07) for $27 with free shipping. V.Me credit card holders can apply coupon code VME10BTS to bring the total down to $24.30. Reviews here.