2 x AA Battery Holder with On/Off Switch & JST PH Connector : ID 4193 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
ABC05 Battery clips for two 1.5V AA batteries - Box Enclosures:
Single AA Battery Holder Connector Wirh 150mm Leads 1 x 1.5V AA Battery Connector Cable : Amazon.co.uk: Electronics & Photo
A9194001, Set of battery clips, 2 x AA - OKW
Amazon.com: 9V Battery Connector,10 PCS T-Type 9 Volt Battery Buckle Connector Hard Buckle Plastic Shell Used in Student Experiment,or Other Equipment with 9V Battery(T-Type, 10PCS) : Electronics