You can also try checking the FAQ/Help section of the supplier's site. They will usually mention and specify how to go about the importation fees for a particular order. Some suppliers may even offer to help you process the necessary documents for an additional fee.
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As Satya mentioned the importation duties/taxes and other fees are normally the responsibility of the importer and not the supplier.
If it's your first time doing this, it would be ideal that you get a broker to assist you with the process.