The price of the product is final, however, there may be costs when crossing the border of your country, depending on the type of declaration you submit. You can ask us for any customs declaration during the cart submission process, you can enter this value in the "Customs declaration" or "Comments" field. However, sometimes Customs will not respect these values so it is a good idea to be prepared to pay the domestic tax when your package arrives. In EU and UK you are going to pay your country VAT from declared value (ex. 20% in UK) + small clearance fees depending on the delivery method, for details please ask local DHL, Fedex or UPS customs agency.
If you are a European citizen / entity and have an EORI number, you can deduct this tax later.
USA customers/entities do not pay tax.