1 Port PCI-e to 4X PCI Slot Expansion Enclosure - Coolgear
Amazon.com: PCI-E to USB Expansion Card Super Speed 7-Ports(5X USB 3.0 A,2X USB C) PCI Express(PCIe) Expansion Card Desktop PC Internal Hub for Windows 10/8/7 and MAC OS : Electronics
Amazon.com: StarTech.com Thunderbolt 3 PCIe Expansion Chassis, External Enclosure With One PCI Express Slot, PCIe Box for Laptops / Desktops / All-In-Ones, 5K/4K Output Via TB3/DP, TAA Compliant (TB31PCIEX16) : Electronics
StarTech.com launches 4-Slot PCIe Expansion Chassis for Windows, Linux, and macOS | BetaNews
AKiTiO Thunder2 PCIe Expansion Box | Thunderbolt Technology Community
Amazon.com: StarTech.com PCI Express to 2 PCI & 2 PCIe Expansion Enclosure System - Full Length (PEX2PCIE4L) : Electronics
PCIe Expansion Systems
AKiTiO Thunder3 PCIe Box | Thunderbolt Technology Community
MSI Thunderbolt 4 PCIe Expansion Card - MSI-US Official Store