No, it's not a glitch. This 100W Anker Prime charger lets you charge up to 3 devices at once, and it's really that cheap.

You can order the Anker Nano Powerbank from Amazon, where it costs $29.99 but can often be found on sale for as low as $19.99 ...

Meanwhile the 7-in-1 Nano Charging Station provides fast laptop charging, and the ability to charge two laptops and a smartphone simultaneously. In total, it features three USB-C ports, 1 USB-A port ...