[cflsystems]

BCSE had a module to assign shipping methods per product. So it will work for you. The think about it I don't like is that all items in cart have to have a common shipping method in order the checkout to work - so product A with Frist Class only and product B with Priority only cannot be ordered together (if I remember correctly how it worked).

Another way to go about this is to have it custom coded and not allow product to be added to cart if address is international or be auto taken from cart at checkout - with some note of course.