40-pin GPIO Extension Board for Raspberry Pi 2/B+ - RobotShop

Raspberry Pi 40 Pin Gpio Extension Board Raspberry Pi Zero Gpio Header Pin - Demo Board Accessories - Aliexpress

Raspberry Pi 40 Pin Gpio Extension Board Raspberry Pi Zero Gpio Header Pin - Demo Board Accessories - Aliexpress

40-pin GPIO Extension Board for Raspberry Pi 2/B+ - RobotShop

Sequent Microsystems Mega-IO Expansion Card for Raspberry Pi/Zero - RobotShop

Geekworm GPIO Extender (G341) / Micro Connectors 1-to-2 40 Pin GPIO Expansion Board for Raspberry Pi 4B/3B+/3B/ Zero 2W/Zero W : Electronics

40 Pin GPIO Extension Cable for any 2x20 Pin Raspberry Pi [150mm / 6 long] : ID 4823 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

40-pin GPIO Extension Board for Raspberry Pi 2/B+ - RobotShop

for RPi Pi IO GPIO Terminal Blocks Breakout Board 40Pin 2.54mm / 0.1 Mini Terminal Expansion Board for Raspberry Pi 4B 3B+ 3B 2B Zero Zero W : Electronics