Amazon has a pretty good deal going on right now. They have the RAVPower Deluxe External Battery CHARGER 14000mAh for $39.99 which is it's normal "low" price over on Amazon (still a really good deal), but they are also tossing in the RAVPower Luster Mini 3000mAh Portable Charger Lipstick-Sized External Battery Pack for free. So you're getting both of these for $40, that includes free shipping. Which if you are an Amazon Prime member, that's free two-day shipping. Kinda hard to beat this deal. The Deluxe External battery pack has two USB ports, while the Luster mini obviously only has one. You can find them both at the links down below.
In order to get them both for $40 shipped, you'll need a Promo code and that code is: P8XV69JC
RAVPower Deluxe External Battery CHARGER 14000mAh Portable Power Bank Pack for iPhone 5S,5C,5 (Lightning Cable not included), 4S, 4, iPad Air, iPad 4, 3, 2, Mini 2, Mini, iPods; Samsung Galaxy S4, S3, S2, Note 3 Note 2; Nexus 7, Nexus 5, Nexus 4; HTC One, EVO, Thunderbolt, Incredible, Droid DNA; Motorola ATRIX, Droid; LG Optimus [Prenium Samsung Batteries, Matte Finish, 4 mobile phone connectors] - Black
RAVPower Luster Mini 3000mAh Portable Charger Lipstick-Sized External Battery Pack Power Bank Charger (Ultra Bright Flashlight with High/Low/Strobe Modes, 5V/1A Output) for iPhone 5S, 5C, 5, 4S, 4, iPod (Lightning Cable not Provided); Samsung Galaxy S5, S4, S3, S2, Note 2; Nexus 5, Nexus 4, HTC Sensation, One X V One X V S, EVO 4G, Thunderbolt; Nokia Lumia 1020, 920 900 N9; Motorola Razr; LG Google Nexu 4 and other Android & Apple Device, Smart Phones, Tablets - Black