The many Trader Joe's in Los Angeles are generally a great place to dumpster dive though some stores are better than others.
See this map of good dumpsters around LA. You can also edit this map. 16 Jan 2018 Update: can someone please dumpster dive this map? It's apparently been " moved to the trash. Please contact the owner to restore access."
Food Not Bombs
Various chapters of Food Not Bombs give out food in Downtown Los Angeles, Santa Monica/Venice and Long Beach.
- See also Pasadena