Trader Joe's is your neighborhood grocery store where you can find everything from frozen and fresh foods, salads, fruits and vegetables, chocolate truffles and matcha green tea to wines and laundry detergent! Their stock of organic food items is quite limited but I always like shopping at Trader Joe's because it is much less expensive than either Whole Foods or Lassens. They have good parking facilities that are usually overcrowded during weekends and rush hours, so you might have to wait for a while before finding a parking spot.
When I am in L.A., I usually go to the Trader Joe's in Pasadena which is close to the Rose Bowl Aquatics center. My friend and I drive there after our swim and I love sampling their coffee and promotional small treats. I also highly recommend trying out their mouth-wateringly, delicious vegan Trail Mix Cookies with raisins and peanuts that are totally awesome!