doing import export with items from europe, based out of NY but doing business in the whole US and canada. what I do is finding an item for a buyer for a particular price, lets say $5000, and selling it for, just as example, $8500. so what I do is sort of an agent.. is there a legal amount, such as a commission amount I am allowed to charge the buyer, or ist it legal to charge what the buyer is willing to pay for the particular item?