This is news to me. In September I bought a kitesurfing foil from a company in France. Shipped to NY state. Did not pay French VAT because it was shipped outside the EU. Was not charged NY sales tax. In October I also bought a kitesurfing foil board from a company in NC. Was not charged NY sales tax (or NC sales tax for that matter). In October I also bought a helmet from Oregon on EBay. Was not charged NY sales tax (or Oregon sales tax). As I was away from Canada for more than one week in both September & October, did not have to pay Canadian VAT (called HST) when I brought the goods into Canada (valued up to $800).
VAT is a national tax which is paid at each resale of an item (or item's components) - literally on the "value added" at each point of sale. So ... a lumber jack collects tax on the cost of a tree sold to a lumber yard, the lumber yard collects tax when the the wood is sold to a furniture manufacturer, the furniture manufacturer collects tax when the chair is sold to a wholesaler, the wholesaler collects tax when the chair is sold to a retailer, the retailer collects tax when the chair is sold to a retail customer. The tax collected at each stage is paid to the government, but reclaimed by each (VAT registered) seller except the end retail buyer who ends up remitting tax for the final sale price of the chair. It's a system that requires a lot of paperwork, but it's "fair" & hard to avoid the tax as there is a paper trail.