Multi-port USB chargers are my favorite new gadget accessory. I have a couple five port chargers in my house right now, and they have become my new go-to birthday / wedding / housewarming / bachelorette party gift as they are pretty cheap and universally well received.
The last one I bought a couple months back cost about $25 dollars, but today on Amazon you can pick up the Poweradd 50W 6 port USB charger for just $15.99 after entering a coupon code ($4 off the normal price).
This Poweradd charger has 3 pairs of ports (2.4, 2.1, and 1.0A) for a total of 10A of charging capacity. The device has a 4.5 star rating with over 1,000 Amazon reviews so it seems to be a pretty solid buy. To apply the discount, just enter the code 9KBWUQIO at checkout. The charger ships free to Amazon Prime subscribers or with any order over $35.