I recently went to LA and didn't find any good ones. I asked the owner of a punk record shop if he knew where I could find any and I got "there are no good zines anymore". Someone else said to try Ooga Booga, I think it's in or near Chinatown, but I didn't get a chance to go, so I'm really no help.
Thank you! I went on Ooga Booga's website. It looks like they have zines but I will give them a call later and ask them to make sure. You would think that Los Angeles would have some zine stores or some records stores that sell a bunch of zines... Hmmm.