Raspberry Pi Compute Module 4 2GB RAM/Lite/eMMC - DFRobot
Raspberry Pi 4 Model B 2GB - Mycroft
Raspberry Pi 4 Model B available for 2GB /4GB /8GB
Amazon.com: Waveshare Accessory Compatible with Raspberry Pi 4 Model B 2GB RAM with Powerful Processor Faster Networking Support Dual 4K Output and Different Choice of RAM Comes with a Copper Heat Sink :