Since the tax is national then there is no cross state safe havens. Not good.
Sure there is, move to another country and buy your stuff there. What kind of safe haven you looking for as regards a "National" as opposed to a state tax?
What happened to the flat tax?
No safe havens other than rescinding your citizenship. Its still an income tax, doesn't get rid of the IRS, doesn't get rid of witholding, doesn't get rid of FICA, is still just as intrusive as the income tax, and is just as complex to figure out what taxable income is inspite of only having to put the final numbers on a single sheet of paper.
Read:
Flat Tax as Seen by a Tax Preparer
by Vern Hoven