4 ports USB 3.0 Hub is sold out currently, but they still has this 5V/1A Power Supply Adapter on sale for $6.99 with code JQS6RWUK.
Code:JQS6RWUK
Features:
Input: AC 100V-240V 0.25A MAX/50-60Hz; Output: 5V 1A
Connector size: 5.5 mm x 2.1 mm; Cord Length: 110cm / 3.6ft
ATTENTION: DC Plug Polarity: inner Positive(+), outer Negative(-)
Compatibility: 5V Household Electronics, Scales, Routers, LED Strip Lights, USB Charging Camera, Tablet PC and other device
NOTE: NOT compatible with laptop or other high power equipment, ie, NOT Compatible with Over 5W Devices and the Polarity could not be reversed
5V 3A US power adapter….meh