5A multi-port USB wall and car chargers.
The Bolse 25W 5A 3-Port USB Car Charger retails for US$14.99 on Amazon. I'd expected three USB ports, but it actually has two ports plus an attached Micro USB cable. The 'three' means you can charge three devices at once.
When Bolse emailed asking me to feature their products, I was skeptical, having never heard of them. A quick search revealed solid Amazon ratings and reasonable prices. The first product I received was this 25W 4-Port USB Charger.
The Anker 25W 5-Port Wall Charger retails for US$19.99 on Amazon. My friend Benjamin ordered for both of us and I shared the shipping, paying S$33 in all. Weighing 166g, it has five USB ports individually labelled by device.