Are you from Canada? Because I just tried that and it wouldn't let me on the page because I didn't have a Canadian billing address.
Yes, I am from Canada, with a Canadian billing address.
Nowhere in the text of the "offer highlights", "offer details" or "offer calendar" pages does it say it is only for Canadians (I just read them all again to check). So it must be once it is into booking that it kicks up that rule.
Sorry :-(
-SW