Micro Connectors 40-pin GPIO 1 to 2 Expansion Board for Raspberry Pi - Single Board Computer Accessories - Memory Express Inc.
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5pcs 2.54 Mm 0.10" Pitch 2x20 40 Pin Elevated Socket Strip Female Header Through Hole Dual Spacer Gpio Contact For Raspberry Pi - Connectors - AliExpress
![40-pin 0.5mm pitch FPC Flex Cable with A-B Connections [25cm long] : ID 4933 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits 40-pin 0.5mm pitch FPC Flex Cable with A-B Connections [25cm long] : ID 4933 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/4933-05.jpg)