From Amazon
StarTech.com 3-Port USB-C Multi-Monitor Adapter, USB Type-C to 3x DisplayPort 1.2 MST Hub, Triple 1080p 30Hz DP Laptop Display Extender / Splitter, Extra-Long Built-In Cable, Windows (MSTCDP123DP)
EE Store
StarTech.com USB-C to DP MST Hub - 3-Port