Well... because we're part of NAFTA, theoretically there shouldn't be much in the way of you selling goods down there - of course, this isn't actually the case - but the major question is what kind of goods is it that you want to sell down there? Some goods are going to be far harder than others. I'm guessing that it's some kind of clothing - chances are there won't be that many roadblocks to your moving goods across the border.
Also it will depend on quantity and regularity - are you looking to set up a business or do a one-time transaction?
Another - and probably the most complex - issue is whether you want to send your goods to more than one state. If you do, each state may or may not have different regulations that you have to comply with.
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