(Editado)Yo pienso que va a estar muy difícil.
Cita: Sales Tax:
Foreign visitors to the United States frequently confuse the sales tax with the value-added tax (VAT). The sales tax is a small tax on purchases (including food and books) or services, calculated at the time of purchase, which individual states and local governments assess and which the U.S. federal government neither determines nor receives. Sales tax is almost never included in the actual sales price noted on the product. The United States does not have a VAT, and the federal government cannot refund state sales taxes.
Yo he leído que algunos pocos estados sí aplican reembolsos a los visitantes, por eso lo mejor es averiguar en Google.