that highly depends on the destination country and shipping type and how many items are ordered.
German example when ordering 4 shirts :
cheapest, but slowest delivery : 8 euro
most expensive but fastest (and tracable) : 9.91
not too much difference there, but that is because germany has a great deal for the fast delivery method. Portugal for example is an entirely different story :
cheapest, but slowest delivery : 8 euro
mid-level, : 11 euro
most expensive but fastest (and tracable) : 32.70 euro
(this is the extreme though)
So it varies per country and by how far away the destination country is from holland and what deal the postal office has made with that country.
Also price depends on whether the country is an EU country, rest of europe or rest of world (of course I'd almost say)