Getting things over the border as an individual is going to be a pain. I've done it with scorpions before and I wouldn't want to do it again. A much better bet is to find someone who will ship things to you from within Canada. Personaly, I'd recommend Chris at Creepyfirstname.lastname@example.org or 613-829-8116. He's in the Ottawa area and has access to a great selection of invertebrates.
Be sure to mention that skinhead Dave recommended him to you.