4CX35AA -- HP - Thunderbolt adapter - PCIe - Thunderbolt 3 x 1 - for Workstation Z1 G5 Entry - ZaynTek
Node Duo - Thunderbolt 3 PCIe expansion chassis for 2 cards | AKiTiO
StarTech.com Thunderbolt 3 to FireWire Adapter - External PCI Enclosure - PCIe Card plus TB3 Chassis - The Thunderbolt 3 to 1394 FireWire adapter connects your FireWire peripherals to your Thunderbolt 3
Those Thunderbolt to PCIe boards which shouldn't exist, but do – Matt's Tech Pages
Amazon.com: StarTech.com Thunderbolt 3 to Firewire Adapter - 1394 FireWire - External PCIe Enclosure / Chassis plus Card - with DisplayPort Monitor Port (BNDTB1394B3) : Electronics
Adapter - Thunderbolt 3 to PCIe USB 3.1 - USB 3.0 Cards | StarTech.com
Shop | StarTech.com Thunderbolt 3 to M.2 PCIe Adapter - External PCIe Enclosure / Chassis plus Card - with DisplayPort Monitor Port - PCIe SSD (BNDTB4M2E1) - interface adapter - M.2 Card - PCIe x4
PCIe x16 PCI-e x16 to TB3 Extension Cable PCI-Express Cables eGPU Adapter Thunderbolt 3 graphics card docking station - Newegg.com
Sonnet Echo Pro ExpressCard/34 Thunderbolt Adapter ECHOPRO-E34
mlogic mLink Thunderbolt to PCIe adapter 854927003046 | eBay
MSI Thunderbolt 4 PCIe Expansion Card - MSI-US Official Store
StarTech.com Thunderbolt 3 to USB 3.1 Adapter - 4 port - External PCIe Enclosure / Chassis plus Card - with DisplayPort Monitor Port (BNDTBUSB3142) - USB adapter - PCIe 3.0 x4 - USB 3.1 x 4 - BNDTBUSB3142
RocketStor 6661A-2USB1 Thunderbolt™ 3 to 2x 5Gb/s USB 3.2 Adapter | HighPoint-tech.com
Shop | StarTech.com Thunderbolt 3 to M.2 PCIe Adapter - External PCIe Enclosure / Chassis plus Card - with DisplayPort Monitor Port - PCIe SSD (BNDTB4M2E1) - interface adapter - M.2 Card - PCIe x4