Raspberry Pi Compute Module 4 IO Board : ID 4787 : $35.00 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Waveshare Compute Module 4 IO Board Pack with RPi Zero V1.3 Camera Cable 15 CM (No WiFi) Compatible with Raspberry Pi Compute Module 4 : Electronics
Getting started with Raspberry Pi: Raspberry Pi Compute Module 4
Raspberry Pi Compute Module 4 IO Board - Seeed Studio | Mouser
Compute Module IO Board Plus, for Raspberry Pi CM3, CM3L. Electronic Nuts Supplier of PWM AC Dimmer for Arduino, Raspberry PI, Microcontroller, MCU
Mini Base Board (B) Designed for Raspberry Pi Compute Module 4 - Melopero Electronics
Raspberry Pi Compute Module 4 Development Kit, With Official IO Board, Basic Accessories, And Optional 7" Touchscreen
Raspberry Pi Compute Module 4 IO Board
Waveshare Raspberry Pi Official Compute Module 4 IO Board A Development Platform and Reference Base-Board Design for CM4 - Newegg.com
Raspberry Pi CM4 IO Board Acrylic Case Transparent Shell for Raspberry Pi Compute Module 4 IO Board|Demo Board Accessories| - AliExpress