MakerFocus Raspberry Pi Universal GPIO Extension Board
Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board - Micro Connectors, Inc.
T-Shape GPIO Extension Board with 40-pin Ribbon Cable for Raspberry Pi
Expansion Board Plastic Cascade GPIO Extension Module For Raspberry Pi 4/3/2/1 | eBay
Raspberry Pi 4B Extension Kit for xArm Robotic Arm – Hiwonder
Raspberry pi GPIO Expansion board
Amazon.com: GeeekPi Raspberry Pi GPIO Screw Terminal Block Breakout Board HAT Kit with GPIO Status LED, Raspberry Pi 4 Case,Raspberry Pi GPIO Expansion Board Breakout Module for Raspberry Pi 4B Only :
SHCHV Raspberry Pi 4 GPIO Sensors Expansion Board AD/DA Digital to Analog Conversion Extension Board for Raspberry Pi 4B/3B/3B+ - AliExpress
MakerFocus Raspberry Pi Universal GPIO Extension Board
Raspberry Pi GPIO Board Extension Board Module for Robot Car DIY Test compatibe for Raspberry Pi 4 Model B / 3B+ / 3B - Newegg.com