To broad a question, but the answer is somewhere on this website.
http://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/menu-eng.html
There will also be PST/GST/HST on the item, even if it is made in a NAFTA country or is used.
There will also be a service fee which varies from $5 (GSP/ PitneyBowes) to $10(Canada Post) to $25 and up (UPS and other couriers).