Raspberry Pi Compute Module 3+ Launches With Faster Quad-Core Chip, $25 Starting Price | HotHardware
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Amazon.com: Pzsmocn IO Expansion Board Compatible with Raspberry Pi 3, Pi 4 and Pi 400. with 40 Pin Contrast Silk Screen, BCM Encoding Information, WiringPi Encoding Information and Color GPIO 40 Pin Cable. : Electronics
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IO Expansion HAT for Raspberry Pi 5 / 4B / 3B+ - DFRobot
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PoE Board IO Module For Raspberry Pi Compute Module 3/ 3 Lite/ 3+/ 3+ Lite x-top | eBay
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I2C Shield for Raspberry Pi 4, Pi 3 & Pi 2 with Outward Facing I2C Port - NCD Store
Raspberry Pi Compute Module 3 IO Board with PoE Ethernet 4x USB GPIO Expansion Board for Raspberry Pi CM3 / CM3L / CM3+ / CM3+L - AliExpress