Well, in French, if you are looking for a bookstore, you can go to Renaud-Bray (
http://www.renaud-bray.com/vitrine_livre_numerique.aspx) to purchase ebooks. That's the largest bookstore in Quebec. Only thing is that they are much more expensive (yes even in epub format!) than the same ebook in English...Same thing at Google eBooks
http://books.google.ca/ebooks?hl=fr
That's why I don't read in French much any more