I am in the L.A. area and post deals I find in the area periodically but So Cal is a big place and the deals and sales vary heavily depending on the specific area you are in. The one good thing about this area is that competition is pretty fierce so I have yet to be able to justify buying in large bulk quantities to save a few pennies per pound. When you buy in bulk, you have to have a big freezer and pay for electricity to keep everything frozen, and around here, that costs more than the meat itself sometimes so I don't bother.
As others have mentioned, the regular supermarket chains can produce some good deals. Keep an eye on the Tuesday circulars, or look at them online. The ethnic supermarkets often produce some of the best deals. I shop at Mexican, Chinese, Korean, and Japanese markets, although the Korean and Japanese ones rarely have good deals. I don't know what you have out there in the 909/951 but I'm sure there are plenty of stores that cater to the Mexican community. Look for a 99 Ranch market for another (Chinese) option. Where I am, there are no Stater Bros., but I'm sure there they are all over the place out there. Also, as others have mentioned, I find deals at Food4Less (Ralph's "warehouse" spin-off), Valu+/TopValu, Smart & Final, and even WalMart.
If you are looking for premium grass fed/finished beef, the choices get smaller and the prices go up, but I have found ground 100% grass fed beef at Sprouts a number of times on sale for $3.99/lb. You are out there in farm land though (sort of) so you might be able to find some local options for beef, chicken, pork, goat, eggs, etc.