LA/OC source for Mozart Chocolates?
You can also try the Alpine Market at the Alpine Village in Torrance (Torrance Blvd. exit off the 110 fwy). I was just there last week and saw all sorts of Mozart-brand chocolates. They are essentially like a more German/eastern European version of Cost Plus. There's tons of yummy packaged imported goods, including Mozart chocolates.
Valley Produce in Reseda has a selection of various-sized boxes of Mirabel brand Mozartkugeln (or at least they had them last October). Some of the boxes also came with some flat disk-shaped chocolates (which I actually preferred to the regular round marzipan balls).
18345 Vanowen St
Reseda, CA 91335
(also another branch in Simi Valley)