Amazon.com: Mini Base Board for Raspberry Pi Compute Module 4, with Standard CM4 Socket and Raspberry Pi 40 PIN GPIO Header, Onboard Multiple Connectors, Suitable for Compute Module 4 Lite/EMMC Series Module :
Raspberry Pi Compute Module 4 PoE IO Board
New Raspberry Pi 4 Compute Module: So Long SO-DIMM, Hello PCIe! | Hackaday
Raspberry Pi Compute Module 4 (CM4) – Holybro Store
Raspberry Pi Compute Module 4 (CM4) - CM4 carrier Board IoT for Gateway – RAKwireless Store
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Amazon.com: Raspberry Pi Compute Module 4 with CM4 heatsink PWM Fan, CM4 4GB RAM 0GB (Lite) Single Board 64-Bit Quad-Core Processor Bluetooth 5.0 Dual-Band WiFi (CM4104000) : Electronics