Hope you can get helpful replies. I have the opposite problem. I'm looking for a good source for more common Canada material, a dealer with a website where I can click and order. I've bought from Arpin, their prices are way high. There's a dealer in PA I refuse to patronize. Those two are the only ones I know of not focusing on high powered stuff.
There are a number of responsible Canadian dealers knowledgeable in classic Canadian stamps. I suggest you look at John Jamieson of Saskatoon Stamps; Gary Lyon of Bathurst, NB; Christopher Green in Ottawa; Robert Cooperman of City Stamps Montreal or Maxime Herald of Canada Stamp Finder Brampton, Ont.