Costco is probably the most popular of the warehouse shopping clubs in the area, partially due to its location right next to Anne Arundel Mall. They have a big selection of frozen foods, including seafood and gourmet items. They have a good meat selection, but produce is limited. They do have the best stock of books and movies, which are way below the regular retail price. If you buy a lot of the same products over and over again (cheese, protein bars, shampoo) you can save money buying in bulk at Costco.