Amazon.com: StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF) : Electronics
StarTech.com USB to Null Modem RS232 DB9 Serial DCE Adapter (ICUSB232FTN)
Rocstor Premium 5ft 1 Port USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI - 1 x DB-9 Female Serial - 1 x USB Type A Male - Black - RS232 Serial Adapter - Y10C225-B1
3ft (0.9m) Serial RS232 DB9 Null Modem Cable with Low Profile Connectors M/F - In-Wall CMG-Rated | Serial RS232 | Computer Cables | USB and PC
DB9 RS232 Serial Cable Male to Male Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (5 - Walmart.com