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How do I get a Tax Exemption Certificate for export from the US if I am in another country?
How do you know you are playing their cost plus tax?   Retailers in the US currently only collect state sales tax on purchasers who are based in the same state they are in.  For example, our business is in NY so we charge NY state sales tax.  We do not charge sales tax for anyone living in any other state (or country). If your shipping address is in South America, the people you are buying from in the US should not be charging you any tax.  You may have to pay customs duties and fees, but these are not sales tax.