They have their hands in everything now. From books to other items to music, TV, movies, and now they're opening their own grocery stores around the U.S. where Prime members can walk in with their phone in their pocket, grab stuff on the shelves, and walk out between two scanners that scan all the items they have in the basket and charge it automatically to their Prime accounts. They've been one of the more entrepreneurial companies in the world over the last decade as they've re-tooled their business models. They're an excellent case study for aspiring business men and I learned a lot about them in business school.