Shipping seems to be a consistent flat rate - you should be able to calculate your tax rate easily based upon where you live. That's going to vary a great deal as each state, county, and municipality is different. Here in Chicago I get a very high rate due to the combo of Illinois state tax, Cook County tax, and Chicago city tax. Do you not know what your local tax rate is?
The bigger the lie, the more they believe. - Det. Bunk