StarTech.com 2 Port USB to RS-232 Serial DB9 Adapter Cable
Got more serial peripherals than you do ports? Don't sweat it, StarTech.com has the solution to your problem with the ICUSB232_2. It equips your system with two RS-232 serial ports while taking up only one USB port! Connecting devices like serial modems, GPS receivers, serial printers, and PDAs has never been easier.