I work in Walnut Creek too, and the building next door to mine has a little cafeteria where you can do the salad/sandwich bar thing, they have soups, a hot meal, or a grill where you can get burgers and fries, etc.....I usually get a cheeseburger with curly fries and a coke for less than $5. Sometimes I bring leftovers, and a lot of the time, I don't eat at work.