I'm in Encino. I bought my chicks from mypetchicken.com and then learned there are a lot of local places that sell chicks. The Red Barn in Tarzana by the busline has chicks...usually barred rocks, black sex link, red sex link and "aracaunas" which might actually be easter eggers. There's another hardware store in Sylmar that I think has barred rocks and rhode island reds and maybe some other breeds There's a feed store around the calabasas area that sells chicks. There's also a Malibu feed store that has chicks. There's a Chatsworth petstore/feedstore called "Kahoots," that carries chicks. There's also a Lancaster poultry farm that sells chicks...you can look for it on craigslist. Basically, try googling "feedstore" in this area....
Currently, I have 4 chickens (3 from mpc and one from Kahoots. Unfortunately, it's addictive and I'm looking at trying to get some really nice chickens. You might want to do a little research and consider getting some quality eggs or chicks from breeders....so they end up looking like the pix online. I'm incubating eggs for the first time. I'm setting 14 Black Copper Marans from Bev Davis's line. Depending how that ends up, I'm then going to try hatching some Ameraucanas. If I have too many chicks, I'm going to find local homes for them. My daughter's school is also hatching two batches but I don't know what breeds they have. They are going to be looking for homes locally.
Also, a FYI...a lot of the local feedstores sell "pine shavings," which aren't pine shavings but fir shavings and/or a mix that looks suspicious for cedar.