10X 2.1 x 5.5mm Male DC Power Plug to 9V Battery Clip Adapter Cable – Envistia Mall
9V to Barrel Jack Adapter - PRT-09518 - SparkFun Electronics
10pcs Experimental 9V Battery Snap Power Cable to DC 9V Clip Male Line Battery Adapter For Arduino Uno R3 DIY Jack Connector new - AliExpress
D'Addario 9 Volt Battery Power Adapter | Sweetwater
Amazon.com: SDTC Tech 3 Pack 9V Battery Snap to 2-Pin PH2.0 Connector Cable I Type Battery Clip Lead Wire (15cm) : Electronics
Dual 9V Battery Connector (Parallel Wired)
Single JST 9V Battery adaptor: 9V battery adaptor for powering motors.
Amazon.com: VWEICYY 9V Battery Connector,10 PCS T-Type 9 Volt Buckle Connector Hard Plastic Shell Used in Student Experiment,or Other Equipment with Battery(T-Type, 10PCS) : Electronics