You can buy the new Surface Pro USB-C dongle in June
Amazon.com: Surface Connect to USB-C Adapter by J-Go Tech | USB C Power Dongle | Works with 45W USB C PD Chargers | Charges Microsoft Surface Pro 6 Pro 5 Pro 4
Microsoft Surface Connect To USB-C Adapter USB-C Adapter 1ft HVU-00001 Compeve Compenet Microsoft Surface Connect To Usb-C HVU-00001 [HVU-00001] - $99.99 : Professional Multi Monitor Workstations, Graphics Card Experts
Refurbished Microsoft Surface Connect To USB-C Adapter USB-C Adapter 1ft HVU-00001 - Walmart.com
Surface 23W USB-C 電源アダプター – Microsoft Store
Microsoft Surface USB-C to DisplayPort アダプター | USB Type C to DisplayPort - Microsoft Store
MICROSOFT Surface USB-C-zu-DisplayPort-Adapter Adapter kaufen | MediaMarkt
Microsoft USB-C® Travel Adapter Hub を購入する – Microsoft Store
Microsoft Surface USB-C Travel Hub Mini Review - Thomas Maurer
Microsoft Surface USB-C-zu-USB-A Adapter
Microsoft Surface Mini DisplayPort to HDMI 2.0 Adapter Black+Surface USB-C to Ethernet/USB 3.0 Adapter - 3840 x 2160p @60Hz - DisplayPort 1.2 standard - Data transfer rates up to 1Gbps - RJ45 Connecto - Walmart.com
usb c to surface connector Off 67% - www.gmcanantnag.net
Surface USB-C to HDMI adapter is pricey but works well for Windows Mixed Reality | Windows Central