The selection is definitely increasing over the years. When you go to bigger cities, you have very big imported food stores (and they are very expensive!). In those stores, you can even buy imported meats, vegetables, fruits, etc. It definitely is nice to have once in a while but you should eat Chinese food as much as possible if you don't want to go broke lol.
Where in Canada are you?
RE: What Kind of Imported Food Is Available in China?