Information for non-USA customers. Since we are based in the USA, we do not add VAT to any items we sell, and we also do not issue VAT invoices. An acknowledgement email is sent to each purchaser specifying what was purchased, what are the prices, and the total amount charged. Please make sure that you are providing a valid email address, so you could receive your purchase receipt. In many countries, books are imported duty-free. But if any duties are owed to the purchaser’s country, it will be responsibility of the purchaser to pay the owed duties.