In order for you to know how much you will be paying extra in Postage & Packing, here is a small guide. They are in Norwegian kroner.

Norway: Free, provided you can pick up at my place/at work. If not:
               1-2 small mice: Kr 80
                any more: Kr 115 (up to 1 kilogram), then Kr 155

Netherlands: Free, provided you can wait a bit longer and are willing to pick up at my parents' place. If not: see Europe

Europe:  1-2 small mice: Kr 105
               any more: Kr 150 (up to 1 kilogram), then Kr 200

World:  1-2 small mice: Kr 130
              any more: Kr 185 (up to 1 kilogram), then Kr 250