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
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USR - USB 3.0 Peripherals: USR808402 2-Port USB 3.0 Super Speed PCI Express Card - Overview & Features
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Buffalo Technology USB 3.0 2-Port PCI-Express Interface Board (IFC-PCIE2U3S2)Up to 5 Gbps Transfer SpeedsBackwards Compatible with USB 2.0Ex... IFC-PCIE2U3S2 - Corporate Armor
PCI-E Card to 4 Port USB 3.0/2.0/1.1 Hub Fiber Optic Extender – Transwan
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Amazon.com: Inateck 2 Port PCIe USB 3.0 Card with Internal USB 3.0 20-Pin Connector - Expand Another Two USB 3.0 Ports, Compatible Mac Pro, No Additional Power Connection Needed : Electronics