I got mine direct from Lone Wolf. It's an excellent reference for Glock owners or anyone who's interested in the plastic pistols. Very detailed instructions and photos for detail stripping the pistol, 25 cent trigger jobs, etc. There's also a good torture test write up and photos.
When I got mine I took my G17 completely apart, right down to the individual parts for the first time and put it back together without a hitch.
Anyway, I don't know any Canadian sources, but you'll be happy you bought it.