GPIO Ribbon Cable for Raspberry Pi Model A+/B+/Pi 2/Pi 3/Pi 4/5 [(40 pins)] : ID 1988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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 40-pin GPIO 1 to 2 Expansion Board for Pi 5, 4, 3 & Zero - Micro Connectors, Inc.
Preassembled 40-pin Pi Wedge Hookup Guide - SparkFun Learn
Raspberry Pi 40-pin GPIO 1 to 2 Extender – Geekworm
Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board for Pi 5, 4, 3 & Zero - Micro Connectors, Inc.
Raspberry Pi GPIO Ribbon Cable 40 x 200mm (7.8in) – Addicore
reTerminal 40 pin connector keyed backwards - Raspberry Pi - Seeed Forum
🇬🇧 Raspberry Pi long tall 40 20x2 pin GPIO header stacking extension extender | eBay
Micro Connectors For Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board | eBay
Soldering the Raspberry Pi Zero Header | DroneBot Workshop
Preassembled 40-pin Pi Wedge Hookup Guide - SparkFun Learn