Amazon.com: TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length,
USB to RS232 Serial Converter -- DataPro
USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Tripp Lite
IOGEAR - GUC232A - USB to Serial Adapter
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable Black NS-PU99501 - Best Buy
USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters
2-Port USB 2.0 to RS-232 DB-9 Industrial Serial Adapter w/ 15kV ESD Surge Protection - Coolgear
Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Converter Cable, 6-Feet (CB-9P6F) | CB-9P6F
USB RS-232 Serial Adapter USB Serial Adaptor Converter Prolific Chip
USB to RS232 Adapter / Converter – CommFront
Mini USB 2.0 to RS-232 DB-9 Serial Adapter w/ 10kV Surge Protection & 3ft. USB Extension Cable
Buy RS232 USB to RS232C Serial Port Adapter - CNC Specialty Store
Sabrent USB to Serial Cable Adapter (SBT-USC1M) | SBT-USC1M
Aten 35cm USB to Serial Converter - UC232A - -
USB 2.0 RS-232 Serial Adapter 16 Inches w/ LED Indicators
Dual port RS232 Serial to USB adapter for RS232 data conversion.