Wiring Computer fans.....

[JDigital]

So, I went to Memory Express today, figuring I could grab a couple fans and a unit that would plug into the wall socket, but sales guy said that that doesn't exist, and that I would need to solder the power to an existing piece of equipment????

I know lots of people use PC fans in canopies, so how did you wire them up? or is there a unit that does plug into the wall outlet that controls the fans?