Meet the New Raspberry Pi 4, Model B - Hackster.io
Amazon.com: PI4B-4GB Sensor Kit, Raspberry Pi 4 Model B 4GB Included with ARPI600 Adapter Board 13x Popular Sensors etc @XYGStudy : Electronics
Amazon.com: BIGTREETECH CB1 V2.2 + Pi4B Adapter Panel Board Kit, Support with SKR Mini E3 V3.0 Octopus V1.1 Octopus Pro SKR 3 Control Board to Run Klipper VS Raspberry-Pi 4/3B for Voron