9V battery holder with switch & 5.5mm/2.1mm plug : ID 67 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
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power - Arduino Nano: This schematic would work? - Electrical Engineering Stack Exchange
Amazon.com: Gikfun 9v Battery Holder with ON/Off Switch for Arduino (Pack of 2PCS) EK2107x2 : Electronics
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