Raspberry Pi 3/4/B/B+ GPIO Multi-Function Expansion Board – Genova Industrial
Adeept Raspberry Pi GPIO Breakout, T-Board + 830 Point Breadboard + 65 Jumper + 40 Pin Cable – Oz Robotics
Amazon.com: T-Type GPIO Extension Module Board Adapter with 40Pin Ribbon Flat Cable for Raspberry Pi 1B+/ 2B/ 3B : Electronics
Raspberry Pi GPIO Board Extension Board Module for Robot Car DIY Test compatibe for Raspberry Pi 4 Model B / 3B+ / 3B Switch Modules - Newegg.com
40-pin GPIO Extension Board for Raspberry Pi 2/B+ - RobotShop
Amazon.com: GeeekPi Raspberry Pi GPIO Extension Board, Raspberry Pi 4 Expansion Board GPIO 1 to 4 for Raspberry Pi 4B / 3B+ / 3B with Screws : Electronics