From Amazon
StarTech.com 4 Port PCI SuperSpeed USB 3.0 Adapter Card with SATA/SP4 Power, Quad Port PCI USB-A 3.0 (5Gbps) Controller Card, Red, Windows Only (PCIUSB3S4)
CCL Computers AMD
StarTech 4 Port PCI SuperSpeed USB 3.0 Adapter Card
This product is also available at 4 unverified merchants.