USB converter - Multi-1/micro USB RS232 - SystemBase Co., Ltd. - speed / serial / RS232
Sabrent USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter 1 ft Cable (CB-RS232) | CB-RS232
StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI – Null Modem - USB 1.1 / 2.0 – Bus-Powered (ICUSB232FTN), Black: Amazon.co.uk: Computers & Accessories
USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics