Good computer Parts store (blatantly and unabashedly off topic)

[David Christian <dchristian@macalester.edu>]

I'm looking to buy an ATX case, but realize that 
I've never tried to buy
computer parts from anywhere other than off the web or at a convention.
Is there a place in the metropolitan area (preferrably southwestish")
where a guy can get parts at reasonable prices?
(Specifically, of course, I mean cases.)

Thanks,
Dave