Markham (Woodbine and Hwy7) has a store that carries some MP stuff. It's a quick drive up the 404 highway from downtown Toronto.
It's called Toys2 or Toys Squared I believe. It's in an Asian mall. Just off hwy 7, east of Woodbine Ave, 5 minutes east of hwy 404.
You might want to just arrange local meets with Toronto area board members if there's something in particular you'd like - much cheaper