Last summer, he sold encyclopedias. This summer, university student Mark Dingman is selling himself - as the first prize in an unusual raffle. Dingman 21, of Toronto, has decided to raffle himself - or more precisely, 16 hours of his time - to make money for school. I wanted to run my own business. This took minimum capitalization and had minimal risk, should it fail, said Dingman, a McGill University student. And it seems like a good skill to learn, to sell yourself. Dingman is going door-to-door with his Student Slaves raffle and a very professional pitch. Tickets go for $1.99 each (or three for $5) and there are 200 in each draw. The first raffle is scheduled for Tuesday and the winner gets Dingman for 16 hours to do anything from cleaning ovens to fixing eavestroughs.