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Not sure about Canada but there are plenty of online Tesla accessory businesses in addition to Amazon. RPM Tesla, TapTas, EVannex, Tesla Parts, Nikola Pro, etc...
The only company I know of that sells Model 3 items IN Canada is: www.teslashop.ca but they only have a limited assortment of products.
Otherwise, www.evitems.com (over $50 USD spent) or www.tsportline.com (periodic free shipping sales) ship for free to Canada under the mentioned conditions, though we will be dinged by customs at the border.