5 x AA Battery Holder with 2.1mm DC Jack : ID 3456 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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8 x AA battery holder : ID 449 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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3 x AAA Battery Holder with On/Off Switch, JST, and Belt Clip : ID 3286 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Yanmis Battery Holder, 10pcs 2X 3X AAA Battery Power Case Plastic Box with Wire Applicable for Electronic Toy Home Appliance Remote Control(2X AAA) : Electronics