If you think $450 is a lot, they seriously think they're getting $729 CAD in Canada. On straight conversion is should be $621, not to mention they're almost certainly getting a tariff hit in the US that they don't get in Canada.
Good point, and it may. The site oddly claims that "taxes and duties included". But that would be an ill-advised move for them for a couple of reasons.
-No Canadian expects that. Our standard is taxes calculated in the final calculation.
-Tax rates differ by province. In Alberta it's 5%, while in Ontario it's 13%, for instance. Which is a big reason taxes are calculated in the final calculation.
So maybe they think they're simplifying prices, but it's not an advised way to do it it. And the "duties paid" for an electronics vendor is a super weird claim in 2025.