Hi,
if your camera purchase or combination of camera holders lens etc is over $1000 then you have to pay import duty. When I bought my 8x10 Tachihara, I got a lens, 2 boxes of film, ten film holders and a lens wrench which came to about $4500. I think I paid about $450-$470 in import duty, which I thought wasn't bad. With the dollar the way it is now, it's a great time to buy from the States.
Mike