The wife and I were shopping at Sam's Club in Irvine a couple of days ago and she said to me "Is that what I think it is?" (not bad for a native CA girl!). Sure enough they are now carrying "Papa Charlie's" Italian Beef...2 2 lb trays of italian beef and "gravy" for about $10.50. Good stuff.
There are places to find the real stuff here in SoCal but they are few and far between. Get some good bread (BTW the Sam's Hoagie Rolls are very good) and some optional sport peppers and/or giardinera and you've got the real thing.
Now I gotta go get some Sabatino's Sausage and make the ultimate combo!