10PCS 40 Pin 2.54mm Pitch Breakway Male & Female Pin Header Kit Straight Single Row PCB Board Connector for Arduino Prototype Shield: Amazon.com: Industrial & Scientific
Amazon.com: MCIGICM 10pcs Male Header Pin, 40 Pin Header Strip (2.54 mm) for Arduino Connector : Electronics
Amazon.com: Generic 40 Pin Breakaway Headers 0.1" Male Equal Length Long Centered 6.25mm on Both Sides 15mm in Total(pack of 10) : Arts, Crafts & Sewing
100pcs Male Header Pins, Lystaii Straight Single Row 40 Pin 0.1 Inch (2.54mm) Male Pin Header Connector PCB Board Pin Connector Electronic Component Raw Materials: Amazon.com: Industrial & Scientific