Startech.com 1 port rs232 serial adapter card with 16950 uart pcie to serial adapter supports transfer rates up to 921.4kbps windows and linux compatible rs2
Price: £48.86
Startech.com 4 port pci express rs232 serial adapter card pcie serial db9 controller card 16950 uart low profile windows macos linux 4 port pci express rs232
Price: £112.46
Startech.com 2 port pci rs232 serial adapter card, dual serial db9 ports, expansion controller card, windows linux, standard low profile dual port pci rs232 serial
Price: £22.06