GPIO Extension Module PCB General Purpose Input/Output Board with Screw GPIO Header Extender for Raspberry Pi 400 GPIO Expander - AliExpress
Raspberry Pi Pico GPIO Breakout Extender DIY Expansion Board Male Female Pin with Switch for RPI Pico W
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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
SparkFun Qwiic pHAT Extension for Raspberry Pi 400 - DEV-17512 - SparkFun Electronics
GPIO Extender for Raspberry Pi 3 & 4 Aluminum case - Mechatronics Art
GPIO Expander Bonnet for Raspberry Pi - Adafruit | Mouser
Pi Port Extender Kit for Raspberry Pi 3/ Pi 2/ Model B+
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GPIO Extender for Raspberry Pi 3 & 4 Aluminum case - Mechatronics Art