I live in both Canada and the USA. I have found in Canada that I can go and have a conversation with Customs. If I can not work out a deal I go back another day and deal with a different agent. I always get the duty, GST down from the original amount. You could also have someone purchase in the States repackage and send it onto you. I did that with my son's suits when he was a little guy and growing out of everything.
Hennessy is a Canadian Company.