C2G 1.5ft Velocity DB9 Male to 3.5mm Male Serial RS232 Adapter Cable - 02444 - Cable Connectors - CDW.com
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Amazon.com: Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux (RS-232DB9 DTE Male Connector, Prolific PL2303HX Rev. D Chipset) : Electronics
Amazon.com: YIOVVOM Connector DB9 RS232 D-SUB Male Serial Adapter 9-pin Port Adapter to Terminal Connector Signal Module with case(Male Connector, DB9 5+5 with case A) : Electronics
3ft DB9 to 3.5mm Serial Cable, RS232 - DB9 Cables & DB25 Cables | StarTech.com
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RS232 Serial DB9 Female Adapter to Terminal Connector Signal Plate Module | eBay