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Waterproof 2xAA Battery Holder with On/Off Switch : ID 770 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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6 x AA battery holder with 5.5mm/2.1mm plug : ID 248 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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3 x AA Battery Holder with 2.1mm Plug : ID 3842 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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