On Amazon right now you can get this handy Anker PowerCore+ mini (3350mAh Premium Aluminum Portable Charger) Lipstick-Sized External Battery Power Bank for iPhone 6/6 Plus, iPad Air 2/mini 3, Galaxy S6/S6 Edge and More (Black) for just $9.99 – a 75% savings! This would make a great stocking stuffer.
This will ship free with Amazon Prime or qualifies for free Super Saver Shipping with a $35 purchase.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.