Sunix - H9MSER40XX - PCIe Card Dual Port RS-232 Serial H9MSER40XX - Sunix - RS-232 Dual Serial Port PCIE Card $52.78
Vscom - PCI-100L - Serial Adapter PCI 1-Port RS-232 PCI-100L - Vscom - VScom 100L UPCI 1 RS232 port Serial RS-232 $72.94
StarTech - PEX4S232485 - Serial Card 4-Port PCI Express x1 RS-232 RS-422 RS-485 PEX4S232485 - StarTech - 4-Port 2 x RS-232 2 x RS-422 / RS-485 PCI Express x1 Combo Serial Card $215.87 $182.94
PCI-1612A-BE - Advantech - 4 x Port RS-232/422/485 PCI Serial Communication Card PCI-1612A-BE - Advantech - 4 x Port RS-232/422/485 PCI Serial Communication Card $224.25 $190.04
Comtrol - 99126-7 - Multiport Serial Adapter 32-Port PCI RS-232/422 99126-7 - Comtrol - Universal PCI Multiport Serial Adapter 32 x DB-25 Female RS-232/422 Serial Via Cable 32 x RJ-45 Female RS-232/422 Serial Via Cable Plu $303.79 $257.45