Tax Free for purchases made in the US, it is impossible. The thing is that in the States, there is no value-added tax (VAT), and Tax Free is its full or partial return to the buyer when leaving the country.

In the US this tax (VAT) is not available, there is only a sales tax (Sales Tax), and it is often not indicated on the price tags. That is why in the check sometimes you can see the amount, the large declared by about 8-10%. The amount of tax will vary from state to state, so this amount may be less or more.

But there are states (Delaware, New Hampshire, the island of Guam) and individual shops where additional taxes on goods are not taken, in addition, a discount of 10% can get students.