I don't need to ramble on for long to explain how having a wall charger with four USB ports is better than an alternative with only one. It's simple math, really. If you have multiple devices on your desk that all plug into a USB port (phones and tablets, generally), or you and co-workers find yourselves scavenging for free power outlets while traveling, a 4-port USB wall charger can ease your struggle.
EasyAcc currently has a white one on Amazon reduced from $29.99 to $12.99 (it's $13.99 in black). On the back, there's a folding plug that allows for easier storage. On the front, port 1 supplies 5V/1.3A, port 2 can handle 5V/1A, while ports 3 and 4 go up to 5V/2.1A. The product maxes out at 5V/4A when all four ports are being used.
If you enter the coupon code 2CP73UGO, the price goes down to just $10.39 (the savings do not apply for the unit in black).
A couple of us on the AP staff have also noticed free one-day shipping with Amazon Prime, a perk that may have something to do with location. But given that we live halfway across the US from one another, the odds may be in your favor too.