PCI-E to USB 3.0 2 Port PCI Express Expansion Card 19-Pin Power Connector | eBay
PCIe to PCIx4 Expansion Box MX with Internal Power Supply
Thunderbolt 3 To Pcie 3.0 X 16 Pci-e Expansion Box Mini Graphics Dock Stand By Audio Card Video Card Networking Card - Pc Hardware Cables & Adapters - AliExpress
NetStor External PCI-Express Enclosure Single PCI-Express Expansion Box Model # NA221A-NB
NetStor PCI-Express expansion box with storage backplane & internal 250W PSU Model # NA211A-LD(NB)