Let's not forget that most of our population lives very close to the US border. Given the shipping differences, it is often easier to have stuff shipped to a nearby US city, and then drive over and get it, than to have something shipped within Canada.
That's how I do it. However, I'm not buying super-hypo het-for-invisible whatevers, I'm usually buying fairly cheap native Canadian species that either no one bothers with or no one legally breeds in Canada due to their protected status. I just confirmed getting some more eastern fox snakes:-)