1 Port USB 2.0 to Serial Adapter Cable - Serial Cards & Adapters | StarTech.com
USB to 2 Port Serial Converter - from LINDY UK
Amazon.co.jp: UGREEN RS232 USB Serial Converter Cable, USB 9 Pin Converter Serial Cable, D-sub9 Pin, Compatible with Windows and Mac OS, 3.3 ft (1 m) : Computers
Tripp Lite 5ft USB to Serial Adapter Cable USB-A to DB9 RS-232 M/M 5' - serial adapter - USB - RS-232 - U209-000-R - USB Adapters - CDW.com
Aten UC232A1 1m USB to RS-232 Converter | Comms Express
Thunderlinx™ USB to Serial adapter - U.S. Converters LLC
IC1101A, USB to Serial RS232 Adapter - Black Box
USB to Serial Converter Lite - from LINDY UK
DIY CHEAPEST USB TO SERIAL CONVERTER | Achu's TechBlog
2.5FT USB 2.0 to Serial RS323 DB9 9Pin Adapter Cable PDA Cord GPS Converter Blue | eBay
RS232 to USB Adapter Cable, 5-ft | Eaton
USB to RS-232 Adapter (35cm) - UC232A, ATEN Converters | ATEN Corporate Headquarters