Amazon, Nordstrom, and other major online retailers I shop at in the US have been charging this on shipments to Blaine for quite some time now. I can't remember exactly when I started paying... for Blaine it is 8.7%, so you shouldn't be charged 10%.
I don't think this will change companies not shipping to WA. This is going to become standard in the US, just as it is in Canada, IMO.
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