Not sure how large the Canadian customer base is on this site. If it is material, I have a couple suggestions:
1. Listing approximate prices to ship from different regions of US to different regions of Canada.
2. Laying it out so you could see approximate prices to ship different kinds of games... NES cart, NES CIB, etc (maybe just approximate weights would suffice)
I shipped a package to Canada and while this site was very helpful with the customs form and how to choose the most cost effective method depending on what you're shipping, I feel it may be a little outdated (but I could be wrong). However, the USPS site is not helpful at all. It says $10 to ship an item but my CIB NES game was almost $19. I did my best to quote it out ahead and the buyer graciously kicked in more money for shipping but I had to cover more than what I expected shipping to be once I arrived at the post office.
Customer support service by UserEcho