Suitable transistor

Need one to power a 12VDC 200mA LED strip from my mega2560. Need to get it from jaycar.co.nz as they have a local store, I have little to no idea how to look for a transistor. Please and thanks.

2n4401 is a NPN 600mA and would work; Attached is an schematic on general usage;

Thank you, I no longer need this meme:

[spoiler]

[/spoiler]