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Single CR2032 Battery Holder with Three Flashing Modes : ID 4891 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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2 x AA Battery Holder with Knife Switch : ID 3951 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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LED Supply Battery Holder - 3AA with Switch and Leads Pack of 4: Amazon.com: Tools & Home Improvement
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Amazon.com: SDTC Tech 4-Pack 2/4/6/8 x AA Battery Holder with Wire Leads 3/6/9/12 Volt Battery Case Box Kit for Arduino Project Led Circuit Experiment : Electronics
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