if you're in Vancouver..
13% HST + 6.9% Duty = 19.9% tax
Simply add that on top of whatever you pay OTD from the US.
For example, you bought a used Z from Michigan for 25,000 before tax.
Michigan state tax is 6%, and I don't know if there is any other taxes involved, but anyways
$25,000 + 6% tax = $26,500
Then when it crosses the Canadian border..
$26,500 + 19.9% = $31773.50
Please do correct me if I'm wrong