Just as an aside, this internet sales tax collection thing is good for the state governments and bad for us consumers (so what else is new). Internet retailers like Crutchfield now charge sales tax for 39 states and that number is increasing as additional states come on board. Lucky you if your state is still in the minority. All the more reason to use sites like Audio Circle to buy.
Crutchfield screwed me last year out of $36 this year for a sale from 2018. To explain: In 2018 they did not collect sales tax for my state PA. So I made a $600 purchase in December without charging state sales tax, which they proudly advertized at that time. Then in February 2019 I get a form that was sent to the PA Dept. of Revenue indicating that I was liable for $36 in state sales tax not collected by Crutchfield in 2018. So now that I was on record with the state, I was "forced" to account for that $36 on my state income tax return this year. It really pissed me off, not by the fact that I was liable for the $36, but by the way they did it. It I was knowingly paying tax at the time of purchase, all well and good. My choice. But to surprise me with it at tax time is a ridiculously poor practice. I can only imagine how others from PA (and maybe other states?) who spent big $$$$$ with them would have received the surprise. I have spent a lot of money at Crutchfield over the years but now am not sure if I will ever buy from them again due to the bad taste left in my mouth from this experience, even though all internet resellers now have to collect PA sales tax as of July 1, 2019.