Customs clearance fees are fees that are charged by either the Customs service or the package carrier for processing the imported goods and filling in the required paperwork. These fees vary between approximately €10 and €20 per package. The height of the fee depends on a number of factors. Each shipping company uses different criteria to determine their rates. The fee usually includes the costs related to customs clearance (filling in the forms, registering the package, etc.) and also extra costs such as storage costs and other administrative fees.
We are currently compiling a list of companies and their fees but it will take quite some time to complete as there are many package carriers and postal companies throughout Europe. We'll get it done, though. Eventually.