Desk calendars are great with perimeter coupons. Refrigerator magnets and mouse pads would work too. Pizza is an impulse food, more impulses more sales. Faculty love to have pizza parties for the students. That's the perfect time to personally hand out the freebies and press the meat, face to face.
People like to do business with people they know and like.
This a very complex area. It involves a lot of answers to a lot of questions. I've done seminars on this topic and have written a white paper on it titled Dominating the Delivery Market. The article is not available in electronic format at this time. I've received many requests for information on this topic.