1 Port PCI-e to 4X PCI Slot Expansion Enclosure - Coolgear
Amazon.co.jp: StarTech.com 4x PCI Slot Expansion Box Slot Expansion Chassis (PCI Express - 4x PCI) for use with PCIe Slot-Based Desktop PCs, PEX2PCI4 : Computers
ExpressBox 16 Smart - PCIe Expansion System - BRESSNER Technology
Amazon.com: Thunderbolt 3 to 10 Gbe NIC - 4 x Open SFP+ Ports - External PCIe Enclosure - with DisplayPort Monitor Port - Thunderbolt 3 to Ethernet : Electronics