The first thing to say is that there are more than enough residency positions for Canadian medical graduates, MD graduates from Canadian medical schools, across the country. In fact, in all provinces there is the opportunity for international medical graduates to find their way into the system and become residents and practising physicians in Canada.
Answering the question about cost is quite difficult and complicated because there are various elements to the costs, and generally they're funded through different pathways and not put together into a total package of cost. There are clearly differences in providing the training in the concentrated population centres like Toronto, where you have a critical mass nearby, compared to in the sparsely populated areas in northern Ontario.