I know - that link is crazy. After a half hour of looking that culminated in that, that was when I just gave up and said no international shipping.
I may end up taking my parcel to the post office and just asking them, though unfortunately the two post offices near me are horrendous -- when I go, I have to keep repeating that they're underpaid government employees, so I should not be annoyed with them.
However, now my Canadian buyer (who it looks like may have registered on the US site as in CA, United States, so that explains how she got around the block on bidders from places where I won't ship), now wants me to declare the bag (which is over $1000) as a gift or "like $68". I've said no, and offered to let her back out of the transaction. I had emailed to ask for her postal code so I could use the shipping calc, and she didn't send it to me, just raised the customs question.
I have to say, this is really not the way I wanted this to go. I was hoping that it would be a nice smooth experience and get my past my concerns...