Well, if your potential buyer wants a shipped price to Canada, he or she obviously can't read too well. Your auction clearly states that you ship to the US (not Canada) and that buyer pays shipping. $60 shipped would be a steal for the person, but, depending on how you deal with the border issues, would likely be a decent loss on your end.
Do you care how much you get out of the deal, or do you just want the pan & gasket outta there?