From Amazon
StarTech 4-Port Self-Powered USB-C Hub with Individual On/Off Switches, USB 3.0 5Gbps Expansion Hub w/Power Supply,Desktop/Laptop USB-C-USB-A Hub, USB Type C Hub w/BC 1.2(5G4AIBS-USB-HUB-EU),SpaceGray
This product is also available at 6 unverified merchants.