Amazon.com: StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF) : Electronics
Delock Products 87785 Delock Serial Cable RS-232 D-Sub 9 female to female null modem with narrow plug housing - CTS / RTS auto control - 2 m
Serial Rs232 Null Modem Cable Female To Female Male To Female Db9 5ft 1.5m Cross & Direct Connection New - Data Cables - AliExpress
Amazon.com: RS232 Cable 15ft, DTECH Null Modem DB9 to DB9 Serial Cable Male to Male RS-232 Cord Cross TX RX line for Data Communication (15 Feet, Black) : Electronics
Amazon.com: StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F - DB9 Female to Female - 9 pin RS232 Null Modem Cable - 2 meter, Black (SCNM9FF2MBK) : Everything Else