They come from CafePress in the US, I'm not sure about duty. I did buy a prop from the show and came from London, they took care of it all, all I had to worry about was the currnency difference-it cost as much to send it as it did to for the prop, but it was on the heavy side. Here's a link to a place that has a currency converter so you'll have an idea as to what it will cost, before the shipping cost. Sorry I can't be of more help, but I hope this will help you out some. Good luck, I hope you'll get a chance to order something.
http://www.xe.com/ucc/