I usually buy: eggs, reduced fat feta cheese, low fat shredded mozzarella, and reduced fat provolone slices, plain light soymilk, yogurt, hummus, canned beans, artichokes and heart of palm, also canned diced tomatoes, frozen foods like veggie burgers and morningstar sausage patties. tuna (the kind in the foil bag, not the can!) tofu, sliced tofurky. and tons of fresh veggies. mushrooms and spinach for my eggs, stuff for salads, to make tomato sauce, and to cut up and dip in hummus. i also buy natural PB, and sometimes sunflower seeds or mixed nuts. oh, and NSA fudgesicles
we buy fish fresh from the market the day we plan to cook it. I'm mostly vegetarian, although I also eat seafood dairy and eggs.
when i first started out with sb, i found it was helpful to plan out my meals for the first few weeks, and base my grocery list on the meal plan. now i just buy a bunch of stuff i know i'll eat, and anything else that looks good to make up a meal later. hope this helps!