Sonnet Technologies USB3C-2PM-E usb3c2pme Allegro Usb 3.1 C-Type 2port Pcie Card 10gbs for $89.96.
Allegro USB-C 4-Port USB 3.2 Gen 2 - Sonnet
Amazon.com: Allegro Pro USB-C 8-Port PCIe Card (Pro Series USB 3.2 PCIe Card with Four USB 3.2 Controllers and x8 PCIe 3.0 Bridge Chip to Deliver Full 10Gbps Per Port) : Electronics
Allegro USB-C 4-Port USB 3.2 Gen 2 - Sonnet
Performance and Power Advantages of Sonnet's Allegro Line of USB 3.1 Gen 2 PCIe Cards - YouTube