Cablecc USB 3.1 Front Panel Socket & USB 2.0 to PCI-E Express Card Adapter for Motherboard : Electronics
StarTech.com 4 Port USB 2.0 PCIe Card - Low Profile (PEXUSB4DP)
USB 2.0 PCI E Expansion Card External 4x 9Pin Header(Can convert 8 port USB2.0) PCIe Card Adapter with 4pin IDE Power Connector - Newegg.com
4 Independent Port PCIe USB Adapter Card - USB 2.0 Cards
Amazon.com: huicouldtool 6 Ports USB 2.0 PCIE PCI-e HUB Expansion Card PCI-Express Card PCI-e 1x USB 2.0 USB2.0 to PCIe Express PCI e Adapter : Electronics
Half / Full Size Mini Pcie Usb 2.0 To Expresscard 54 / 34 Slot Adapter Pci Express Mini Card To Express Card Converter Reader - Buy Mini Pcie Usb 2.0 To Expresscard
8 Port Usb 2.0 Pci-express X1 Card (6 External Ports And 2 Internal 9 Pin Ports) - Add On Cards & Controller Panels - AliExpress
StarTech 6-Port USB 2.0 PCIe x1 Controller - Serverschmiede.com GmbH
4 External Port and One Internal Port USB 2.0 PCI-e x1 Card
StarTech.com 4 port PCI Express LP USB Adapter Card Add 4 USB 2.0 ports to your low profilesmall form factor computer through a PCI Express expansion slot pci express usb 2.0 card