StarTech.com 4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART - Low Profile Serial Card (PEX4S553) - serial adapter - PCIe 1.1 - 4 ports
StarTech.com 4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART - Low Profile Serial Card (PEX4S553) - serial adapter - PCIe 1.1 - 4 ports

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The PEX4S553 4-Port Native PCI Express RS232 Serial Adapter Card with 16550 UART lets you add 4 RS232 (DB9) serial ports, using a single PCI Express expansion slot.