@dagmaraka,
Dag, I occasionally get wrangled into international shipping, and have found USPS to be the best option for $$. (parcel post is slow, but effective)
Don't know the size limits, but I could investigate a bit if I have time today.
You might talk to in import / export business near you, I know there are private companies splitting containers internationally. I have a friend that buys from China, but no insight...