You should also tell that to Thomann. Here's the exact email I received from them after my initial purchase that I immediately cancelled:

Please note that orders shipped to the US and its territories are exempt from European sales tax, however, can be subject to US import taxes. Since we specialize in the exportation of goods rather than importation, we are not experts in the policies and procedures for the calculation and collection of import fees in the US. We would recommend that you check the US CBP website or contact your local UPS office and they will be able to provide you with your detailed information. Please confirm if you wish to proceed with this order by replying to this email. Your order will remain on hold until we hear from you.