Amazon.com: 30 Pcs 40 pin Breakable Pin Header 2.54mm Single Row Male Header Connector Kit PCB Pin Strip for Arduino : Electronics
Amazon.com: 2 x 20 (40 Pin) Extra Tall Female 0.1 Inch Pitch Stacking Header Compatible with Raspberry Pi A+/B+/Pi 2/Pi 3 Extra Tall Header (Pack of 8) : Electronics