Apple ripping people off with the black MacBook 1704
Depends on scale; you'll price breaks at different levels. Depending on the difference in number of pieces bought, it could be noticeable. (But not $130 worth; the...
No.
Mostly because every state has different (from none to high) sales tax rates, and you may also get tagged with additional county and-or city sales taxes on top of the state levy. And delivery, if any, is extra. (Apple does not charge for delivery on orders above a certain level; other companies might.)
Then you get states (*coff*california*coff*) that will try to hit you with taxes if you live there and you're buying from out of state, or living in another state buying from a company based in California.
A little while back, California spent no little time and effort to extract taxes from people's retirement checks; said persons not living in California, but the company they had worked for, and was paying their retirement benefits, had operated in the Golden State.
One wonders if being part of the EU brings up any similar complications...