DB9 Male to Male Gender Changer | Computer Cable Store
Amazon.com: DTech 3-Pack Serial Adapter Female to Female DB9 Gender Changer Female to Male 9 Pin Connector Male to Male RS232 Coupler Mini Size for PC Computer Data Transfer : Electronics
DB9 M/F Gender Changer [10GC-D2] - $7.95 : Serial Data Communication by U.S. Converters LLC
Adaptor and Dongles to convert RJ45 Serial to DB9 Serial