votrechien - 8:49 pm on Jan 8, 2013 (gmt 0)

You'll have to figure out the weight and dimensions of the product as well as the formula your drop shipper is using.

With that being said, it can be very difficult to figure out the exact cost for every single product. If you have some basic info, most importantly the weight, you can estimate costs to the U.S. fairly accurately provided you know what carrier they're using.