Duties and taxes are collected by the importing country and are the responsibility of the importer. Estimating the importing duties and taxes for any given country is as much an art as a science. It can cost more for the taxes in some countries as it cost for the products themselves. Don't import t-shirts if you aren't willing to deal with determining the taxes and duties because there is no way around them and the import duties, taxes and fees will need to be paid for the products can be delivered.
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