Yeah, Microcenter and I think CompUSA stock them too. I recommend picking up an anti-static mat too, if you do a lot of work on computers. The good part about that is too, when you have the PC open and possibly on its side operating on things, the mat helps prevent the surface from being scratched up by the computer's case and metal parts sticking out. It's a good idea if you ever do any on-location work for clients.
Also, if you use the "touch grounding" method, unplug the PSU, the issue is relative potential voltage, not earth ground. Leaving it plugged in is risky and asking for trouble in certain circumstances. Wise techs unplug.
(Yes, I found out the hard way.)