Amazon.com: CP Technologies USB 2.0 Serial Adapter (CP-US-03) : Electronics
US232R-10-BULK - FTDI
Tripp Lite RS232 to USB Adapter Cable with COM Retention (USB-A to DB9 M/M), FTDI, 5 ft. - USB / serial cable - USB to - U209-005-COM - USB Cables - CDW.com
USB to RS-232 Serial Adapter DB9 - 8 Inch Short Cable