california I'm sure has some.
a lot of costumes can be found online too. I was actually browsing
Cosplay Magic yesterday...
...my mom made my Rinoa costume, and I bought my shinigami outfit at A-Kon.
they get hella expensive though. the prices you'll see at cosplay magic are typical. you might be better off making your own and buying any oddball pieces that can't easily be made, if you can!