The benefits of these types of stores are twofold... 1) they are about half the price of shopping in a regular supermarket and 2) their product is fresher and uses less sprays and chemicals.
These stores generally sell wholesale/bulk to restaurants and therefore turnaround product quickly. This allows them to charge less and the products don't need to have such a long shelf life or look "pretty" and shiny like they do in the supermarket.
If you are not in Los Angeles but want to find a store like this near you I suggest doing some research and finding out where your local restaurants buy their produce. Or if you know of a local produce store in your area post about in the comments section here so that others in your area can find it!
Okay, let's start cooking... and eating!