Hillman Solid Wire Harness Wire (By-the-Roll) in the Specialty Wire & Cables department at Lowes.com
Amazon.com: RuiLing 5pcs 9V Battery Clip with 15cm Lead Wire I Type 9v Cell Holder DIY Battery Buckle Connector : Electronics
Amazon.com: LAMPVPATH (Pack of 5) I-Type 9V Battery Connector, 9 Volt Battery Clip, 9V Battery Clip Connector with Wire and Hard Buckle Plastic Housing : Health & Household
9 Volt Battery Clip
Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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