Books A Million Inc. also known as BAM owns and operates the second largest bookstore chain in the United States, operating 260 stores in 32 states. Stores range in size from 4000 to 30000 square feet and sell books and magazines and toys technology and gifts.Books A Million Inc. also known as BAM owns and operates the second largest bookstore chain in the United States, operating 260 stores in 32 states. Stores range in size from 4000 to 30000 square feet and sell books and magazines and toys technology and gifts.