a current student here
If you love junk food, then the convenience store has all those goodies, plus some campus gear, school supplies, and personal items such as cold medicine. For vegetables, bread, and produce, a farmer's market is held every two weeks right in front of the campus bookstore. Speaking of which, always compare the textbook prices (including sell back value) with other sites like Amazon (I've had a couple of textbooks that were cheaper at the bookstore). The best bang for your buck is the 50-cent-coffee sold at the bookstore. It's not fancy, but the caffeine will keep you up come finals week (the bookstore also sells caffeinated chocolate bars).