Black Cylindrical 3 AAA Plastic Battery Holder Adapter Case Box Flashlight Lamp | eBay
3 x AA Battery Holder with 2.1mm Plug : ID 3842 : Adafruit Industries, Unique & fun DIY electronics and kits
3x AA Battery Holder with On/Off Switch and 2-Pin JST | The Pi Hut
Low Voltage Power Solutions: Battery Holder – 3 AAA Battery Case with JST-PA Plug (Locking) – Triple AAA Battery Holder for Arduino, Lilypad Circuits, Cosplay, Costumes and Decorations - Set of 2:
Eveready Super Heavy Duty AAA Batteries (Pack of 4) RO3B4UP
3 X AAA Battery Holder With On/Off Switch - Altronics