Amazon.com: ZRM&E 6V Power Box 4xAA Battery Holder Case with DC 5.5x2.1 Connector Mate with Barrel Jack Connector on Arduino : Electronics
Portable Battery Power Supply Shield Kit For Arduino
LilyPad Power Supply Module AAA Battery Step up to 5V Converter for Arduino
AMX3d Lilypad Power Supply - Single AAA Battery Holder - Step Up Input 1.2~5 Volt Output 5 Volt 200mA Converter Module - Voltage Regulator Component for Lilypad, Arduino, Raspberry PI - Walmart.com