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Amazon.com: 2x20-pin Extra Tall Female Stacking Header 0.1" for Raspberry Pi A+ Pi Model B+ Pi 2 Pi 3 (Pack of 2) : Electronics
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GPIO Stacking Header for Pi A+/B+/Pi 2/Pi 3 [Extra-long 2x20 Pins] : ID 2223 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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36-pin Stacking header - pack of 5! : ID 3366 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Shield Stacking Header Set Compatible with Arduino MEGA 2560(Pack of 2 Sets) : Electronics
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