C2G RJ11 Ethernet Network Cable For DSL Internet, 100 foot long, 28726 Transparent Blue

Usangreen PL2303GT USB RS232 to DB9 Cross Wired Rollover Null Modem Cable (Null modem pinout: 2-TXD, 3-RXD 5-GND, 7-CTS. 8-RT)

USB to RS-232 DB9 Female 9 Pin Null Modem Rollover Serial Adapter Cable for Windows,Linux MAC OS (Null Modem)

StarTech.com 25 ft Cross Wired DB9 Serial Null Modem Cable - F/F - 25ft DB9 Null Modem Cable (SCNM9FF25)

Monoprice DB9, M/F, Null Modem Adaptor

Tripp Lite Null Modem Serial RS232 Cable (DB9 to DB25 F/M) 6-ft. (P456-006)

DTECH DB9 RS232 Female to Female Null Modem Serial Cable Simple Cross TX RX line Cord for for Computer Switch Laptop Router Data Communication (10 Feet, Black)

Networx Computer Cables - Serial/Null Modem (6 Feet, Serial - DB9M/M)

CableWholesale Null Modem Adapter, DB25 Male to DB25 Female