Did you provide US insurance and driving history while getting the quote?
Yeah, that was included.
@lampbreaker, that's what I figured. The guy at Sonnet was very helpful and also advised catching cheaper prices on them in the summer. We also may end up choosing those tires that function as both winter and year-round tires. They'd be more expensive but save us on storage and changing them (can't do either where we'll be living), but that decision will also depend on what our commutes are like since I've read they're not quite as good as dedicated winter tires.