Aukey makes a ton of great power and charging options and there is currently a deal to be had on their 12W USB wall charger. This is a great option for those who travel regularly as this is one of the smallest USB wall chargers available. Not to mention, it comes with two USB ports for charging two devices at the same time. Each port offers 2.4A charging and while the charger is currently listed on Amazon for $11.99, if you use coupon code P29QKQHL you can bring the cost down to only $6.49.
Aukey 12W Dual USB Wall Charger $6.49 - Coupon code P29QKQHL