I'm a huge fan of Trader Joe's. They have such a variety of American, ethnic, and other foods, and their prices are pretty good. I've always stocked up on their freezer items, which are always very easy to make (I don't think anything really requires more than about 20 minutes in the oven). Try the gnocchi in the freezer section (heat it in a pan for seven minutes - it even includes the sauce!), and the pizzas are also great and unusual (like pesto pizza). Also, the cold section is good, where they have BBQ shredded chicken (yum!) and ready-to-go salads and wraps. They also have $3 wine - that's right, $3 wine. It's pretty good too! They also are always giving away samples, so use that as a chance to try a new item.