Raspberry Pi 400 and the Waveshare RPi 400 GPIO Header Adapter

Waveshare Raspberry Pi 400 GPIO Header Adapter, Header Expansion

Raspberry Pi 400 Kit – Raspberry Pi 4-based PC Kit (EU)

Monk Makes GPIO Adapter for Raspberry Pi 400 - RobotShop

Raspberry Pi 400 GPIO Header Expansion Adapter, with Color-Coded Green

GPIO adapter - extension for Raspberry Pi 400 - Botland - Robotic Shop

Raspberry Pi 400 and the Waveshare RPi 400 GPIO Header Adapter

Waveshare Raspberry Pi GPIO Adapter designed for Raspberry Pi 400 Keyboard Computer, 2x 40PIN header expansion, color-coded header Leaning version,

Waveshare Raspberry Pi 400 GPIO Header Adapter Header Expansion 2X 40PIN Header Leaning Version Designed for Raspberry Pi 400

GPIO port expander for Raspberry Pi - Kamami on-line store

Raspberry Pi Prototype and GPIO in Canada