I'm not 100% sure. I tried reading the US customs website before but got confused. Maybe other people know.
I think you can have up to $400 without being taxed. I bought 3 solids from Harrods and didn't get taxed. It was definitely over $400. I don't have any idea how much customs charge. They seem more concerned with alcohol, tobacco, and illegal drugs. I don't mind. <img src='style_emoticons//tongue.gif’ border=’0′ style=’vertical-align:middle’ alt=’tongue.gif’ />