There's a small place down in the market... It's one road past the beaver tail hut, to the right with your back to the mall... Around the totem pole. You've got to walk, and look for it.
http://www.yellowpages.ca/bus/Ontario/Ottawa/Irving-Rivers-Ltd/2334898.html?what=surplus&where=Ottawa, ON&cli=0,2&le=125b14df1f1|125b14df1ec|125b14df1ee
It's been a while since I've been there, but you should be able to get some.