If your concern is specifically The Tin Flute by Gabrielle Roy, eNotes does offer three study guide sources:

I think you are better off choosing a particular author for Canadian literature.  Enotes does have many Canadian authors, but you have to look under the names or works themselves.

There is a Cambridge Companion to Canadian Literature out there... Cambridge publishes some nicely varied and representative anthologies. 

Are you looking for literary criticism or study guides on any particular writers? Looking around online a bit, there seem to be some resources out there - not as many as are available for American literature - but we might need to get specific with our searches to find what you're looking for.