Amazon.com: Chanzon 9v Battery Clip with 2.1x5.5mm Female DC Connector I-Type Plastic Holder and UL Wire Pack of 5pcs kit for Arduino,LED Strip : Electronics
Single JST 9V Battery adaptor: 9V battery adaptor for powering motors.
9V Battery Clip to DC Plug Connector 2.1 x 5.5 mm Tip Positive 5" Adapter Cord
10pcs Experimental 9v Battery Snap Power Cable To Dc 9v Clip Male Line Battery Adapter For Arduino Uno R3 Diy Jack Connector New - Integrated Circuits - AliExpress
9V to Barrel Jack Adapter - PRT-09518 - SparkFun Electronics
Voodoo Lab Battery Snap to 2.1mm Pedal Power Cable - 18" Str-9v Snap | Sweetwater
Addicore 9V Battery Cable and Barrel Plug
D'Addario 9 Volt Battery Power Adapter | Sweetwater
10X 2.1 x 5.5mm Male DC Power Plug to 9V Battery Clip Adapter Cable – Envistia Mall
9V Battery to DC Plug Adapter Cable - ProtoSupplies