My dorm back in college ALWAYS ordered Powelton Pizza for all their social events. Why? Because for every ten pizzas you guys, you get another one free. This is great when you are feeding over 100 very hungry college students. Their pizza is thin, tends to be oily and is not the most scrumptious around. However, their prices are inexpensive compared to the rest. Their delivery is fairly fast and they do serve other foods (such as pasta, subs, wraps, and typical pizza restauranta food fare).
Their customer services tends to be rude, but if you ask nicely, they will provide you with cups, napkins and paper plates along with your order. They are open late and for a college campus, that is always a plus.
So, if you are just hungry and don't mind your pizza being greasy, thin and overall not very yummy but are looking to save, Powelton Pizza might just be the late-night delivery food service for you.