I was wondering that myself. The two shops I know
of in California that sell cels have closed up
(Mandarake in Santa Monica) or are in the process
of moving (Animate in Hollywood). However, I just
found out that Aloha Anime appears at the Frank &
Son Collectible Show in the City of Industry,
which runs every Wednesday from 4:00pm to 8:30pm
and every Saturday from 10:00 AM to 3:00pm.