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): Home Audio & Theater
Amazon.com: Generic Female Header Right Angle 0.1" 6-pin for Arduino and LilyPad(pack of 10): Home Improvement
Break Away Single Row Round Headers Machine Pin Female 2.54mm 40 Pins Gold Plated(pack of 10) - - Amazon.com