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Raspberry Pi Compute Module I/O Board V3 : ID 3442 : $114.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Raspberry Pi Compute Module 4 IO Board : ID 4787 : $35.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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Waveshare Raspberry Pi Compute Module 4 IO Board with PoE Feature (Type B) Suitable for Variants of CM4 - Newegg.com
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Amazon.com: for Raspberry Pi Compute Module 4 IO Board,Mini Base Board (B) Full Version with Standard CM4 Socket and Color-Coded Raspberry Pi 40PIN GPIO Header Onboard CSI/DSI/FAN/HDMI/USB/RJ45 Connectors : Electronics
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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 :
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Arduino Compatible Base Board For Raspberry Pi Compute Module 4, HDMI, USB, M.2 Slot - Melopero Electronics
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