I took out a loan from CanHelp, which is a branch of TERI. It really depends on how much you need. OSAP only gives 5K I think per year which isn't much at all. Many Canadians also get student lines of credit from banks, but I think the maximum for all 4 years is 100K canadian. So, CanHelp is really the best option for full funding.
Feel free to PM me if you have any other questions.
UPitt, SDM, Class of 2007