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Electronic Master USB to RS232 Cable EM620503 - The Home Depot
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
PRO Single Port USB to Serial Adapter with Activity LED 3ft.
USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | StarTech.com
Amazon.com: StarTech.com 1 Port USB to Serial RS232 Adapter - Prolific PL-2303 - USB to DB9 Serial Adapter Cable - RS232 Serial Converter (ICUSB232V2) : Electronics
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