I have bought several things from sellers on this forum in the States and not had any trouble. Most folks are willing to try it if you are willing to work with them. And for those that don't want to, well, there is usually more than one seller.
But anyone looking to import a knife into Canada should be aware of some things.
I don't know what Canada's regulations are but a quick look indicates 5%+ up to 10% VAT.
This is correct. There is a base 5% tax called the GST which is a federal tax on all goods and services. Some provinces charge a provincial sales tax, which is bundled with the GST to become a 10% HST (harmonized sales tax).
A lot of Canadians think that because of NAFTA (North American Free Trade Agreement), there is no duty on goods purchased from the USA.
This is not true.
With a very few exceptions, all goods and services purchased from the USA are subject to GST or HST, and some are subject to additional duties. Textiles (clothes) and some tools (like maybe "camping tools") are two of the most heavily penalized. This is why it is so important to be honest about what is being imported so that it cn be assigned the correct tariff code for processing.
It is also important to note three things pertinant to this particular discussion:
1. The Canadian buyer of the goods is the importer of record and is the one legally responsible for any taxes/tariff, not the seller.
2. If you are a Canadian buyer and you ask the seller to send you a purchase labelled as a "gift", you are committing a crime and are counselling the seller to commit one on your behalf. Don't do it.
3. Parcels shipped via USPS/Canada post will usually only be assessed with the tax/tariff as additional fees, possibly a nominal processing fee. Common carriers like UPS and Fed Ex will assess brokerage fees in addition to taxes, duties, and handling. This is why the COD charges on some purchases shipped with these carriers can be so high.
Yes, I used to work for UPS and have a certificate from CSCB.