USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
USB to RS232 TTL | CMOS Adapter Cable with Terminal Block - Coolgear
USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter - Sabrent
Mini USB to Serial Adapter Hi-Speed 920K FTDI Chip
High-Speed USB-to-Serial Adapter for Windows 8 32/64-bit - U.S.Converters
RS232 Adapter - TE Technology
USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
StarTech.com 3ft (1m) USB to Serial Cable, DB9 Male RS232 to USB Converter, USB to Serial Adapter, COM Port Adapter with Prolific IC, 1 (Quantity) - Walmart.com
Rocstor Premium 5ft 1 Port USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI
6FT RS232 DB9 9Pin Female to USB 2.0 A Male Serial Cable Adapter Converter Cord | eBay
RS232 to USB Adapter Cable, 5-ft | Eaton
USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters | StarTech.com
USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | StarTech.com Italy
Amazon.com: Cable Matters USB to Serial Adapter Cable (USB to RS232, USB to DB9) 3 Feet : Electronics
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
C2G 1.5ft USB to Serial Cable - USB to DB9 Serial RS232 Cable - M/M - 26886 - USB Adapters - CDW.com
Electronic Master USB to RS232 Cable EM620503 - The Home Depot
USB C to Serial Adapter Cable RS232 DB9 - Serial Cards & Adapters | StarTech.com
USB to serial RS232 adapter with two ports
USB to Serial RS-232 DB9 FTDI Mini Adapter with Extension Cable