Canada buying and then selling them to the USA more expensive than direct but cheaper than with the penalty.
Taking in mind that those are among some of the most faked products in the world I would not surprise if a black market emerges to overcome regulation and somebody became pretty rich selling counterfeits.
Maybe US now will need a wall also in the North, who knows?. Other probably scenery is that a lot of US citizens start self-restricting themselves to consume only US products that is a perfectly respectable option also (but would increase pressure against US nature).