Only the safe and sane are legal in California. Most cities in SoCal have banned them except mine. They look the other way when it comes to the illegal stuff because everyone lights them off. At work we used to have the China connection and access to some pretty awesome stuff at super cheap prices. We would get it directly off the ship from the crew members, but customs started cracking down on us about 10 years ago.
I used to make my own “firecrackers”, but after 9-11 that became a serious crime and not worth messing with. I usually buy a supply on July 5th at half off and save it for New Years.