When shipping by USPS to Canuckistan, we are forced to use Priority Mail (which costs twice as much as Parcel Post) if the package is over 4 pounds (1.82 kg or so for you Greenlanders). We have to use the 'long' customs form for those packages too. Last time I shipped a saw to Canada it cost something like $70. I shipped a saw that weighed twice as much to Iowa a few months before, and it was $40 or so. Longer distance, larger/heavier package, but much less moolah....
I simplified my life a few years ago by not shipping to any foreign country, Continental USA only. I'd hate to see my fine merchandise being sent to a communist or muslim country.