in the US, you should only be taxed for online orders if the order can be physically within your state. otherwise it would be illegal. that's why i get $0.00 tax from most online stores (only one i've found is apple stuff iirc) cus nobody wants to set up shop in alabama :'^] (not sure if there's some weirdness for one or two states, but that should be the case)
so i ordered around $1500 of parts, including a 1070 from evga, and didn't pay tax on any of it wew. not sure what would've happened if i got a card from nvidia, because i know there's a mysterious office with the nvidia logo pretty nearby where i live