Amazon.com: ASUS ThunderboltEX 4 Card, PCI Express, 2 x Thunderbolt 4 (USB-C), 2 x Mini DisplayPort in, TBT Header, USB 2.0 Header : Electronics
Buy MSI Thunderbolt 4 PCI-E Expansion Card [MSI-TBM4] | PC Case Gear Australia
Allegro USB-C PCIe – SONNETTECH
MSI ThunderboltM3 PCI-E 3.0 x4 Add-on Card for 2 x Thunderbolt 3 (USB-C) Ports - Newegg.com
Amazon.com: ASUS ThunderboltEX 4 with Intel® Thunderbolt™ 4 JHL 8540 Controller, 2 USB Type-C Ports, up to 40Gb/s bi-Directional Bandwidth, DisplayPort 1.4 Support, up to 100W Quick Charge. : Electronics
Allegro Pro USB-C 8-Port PCIe Card - SONNETTECH
Peering inside a multiport USB-C (and Thunderbolt 3?) hub - EDN Asia
MSI Intros USB4 PCIe Expansion Card with 100W Power Delivery