Welcome to the forums, ImpalaEd
I'm Canadian, and I've bought a good number of books from Kobo and Sony in addition to the enTourage ebook store. See the second post here for the URLs:
http://www.entourageedge.com/forums/...p?1115-E-Books. As a rule, if a book is available as an ebook, I've been able to buy it somewhere.
I do often hunt and seek for the best deal. Most sites don't indicate region on each book, but if you've logged in with an account and the system knows your Country, then it should show only titles you can actually buy.