From OnBuy
StarTech.com 4-Port USB-C Hub - USB-C to 1x USB-C and 3x USB-A - USB 3.0 Hub
Novatech
StarTech.com 4 Port USB 3.0 Hub - USB-C to 1x USB-C and 3x USB-A - Portable USB-C Hub - USB Type-C Hub
This product is also available at 6 unverified merchants.