Wal-Mart is usally the first place where I have spotted them.  My local comic shop has imported them in as well. 
Here is what I don't get.  If TRU can release their exclusives in Canada without the lame international packaging, why don't the single carded figure get the same treatment?   I hate the international packaging.  
Don't think they can release them in Quebec.  Or, maybe Quebec chains refuse to sell non-international packaging.  I live next door to Quebec and even in this part of Ontario, the big chains won't carry non-bilingual singles.  Makes me think local managers have a say.
Either way, my money's on Quebec holding up wide-spread non-bilingual releases.