New Mini Null Modem Db9 Female To Db9 Female Plug Adapter Gender Changer New - Data Cables - AliExpress
StarTech.com USB to Serial Adapter - Null Modem - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter - Add a Null Modem RS232 serial port to your laptop
Mini Serial Null Modem Cable Adapter Converter M/F Male to Female DB9 RS232 New - Walmart.com
DB9 M/F Null Modem Adapter
Monoprice DB9 Male/Male Mini Null Modem Adapter - Newegg.com
DMA060MF - L-com - D Sub Connector Adapter, Null Modem, Standard D Sub