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Amazon.com: Waveshare Accessory Compatible with Raspberry Pi 4 Model B 4GB RAM with Powerful Processor Faster Networking Support Dual 4K Output and Different Choice of RAM Comes with a Copper Heat Sink :
Source Pi 4 - Retropie Pack Packet Modle B Model Raspberry 4Gb Ram on m.alibaba.com
Raspberry Pi 4 Model B available for 2GB /4GB /8GB