2PCS Raspberry Pi GPIO adapter board module for Raspberry Pi extension board | eBay
RaspberryPi GPIO breakout T-shape
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40 Pin GPIO Extension Cable for any 2x20 Pin Raspberry Pi [150mm / 6 long] : ID 4823 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
2pcs Raspberry Pi GPIO Breakout Board Breadboard Adapter T Shape + Straight 810673030491 | eBay
GPIO Adapter for Raspberry Pi v3 Model B (T shape) | Open ImpulseOpen Impulse
Waveshare Raspberry Pi 400 GPIO Header Adapter with Header Expansion – Vilros.com
Amazon.com: Ultra-Small RPi GPIO Terminal Block Breakout Board Module, for Raspberry Pi : Electronics
The GPIO Connector | Adafruit's Raspberry Pi Lesson 4. GPIO Setup | Adafruit Learning System