Sitecom USBC to 3+1 USBC 10Gbps Gen 2 Hub
This one has gotten some poor ratings, it's only available in the UK. I ordered one but I'm still testing to see what the deal is. Eventually I'll take it apart to see if it has the Cypress Chip in it. It does claim to be Gen 2 10Gbps and it has 100W Power Delivery. I've heard however that it doesn't do well with Macs. Apple had some trouble with USBC recently that was supposedly cleared up with driver updates, but we'll see. It's expensive, but Cool Gear is probably the safest route.
Edit: Looks like it popped up in the US:
Sitecom USBC to 3+1 USBC 10Gbps Gen 2 Hub - Amazon US
Sitecom USBC to 3+1 USBC 10Gbps Gen 2 Hub -Amazon UK