Remember that if you purchase from a US ebay seller etc there will be tariffs and/or customs clearing charges along with provincial tax.
Vermont Castings still makes their stoves in the USA.
Tariffs are paid by Americans who are importing.
Canada has dropped most of our retaliatory tariffs on USmade goods.
You are right that there will be duty and sales taxes on imported goods. The shipper may also add "customs brokerage fees" which can be as little as $9.95 with Canada Post but much higher with private shippers.
You might be able to find VC dealers in Canada by asking the company for a list. At one time, when I was selling them (and owned a blue enamel Resolute) the dealers formed a friendly network to import stoves en masse, reducing our costs.