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: Amazon.co.uk: Electronics & Photo
PP3 9V Battery Clip 150mm Side Entry | Switch Electronics
ProTechTrader 9v battery eliminator - convert 9-volt battery powered electronic devices to connect to a wall power adapter: Amazon.co.uk: Electronics & Photo
10pcs 9V Battery Connector | Open ImpulseOpen Impulse