I've never shipped overseas, but I can tell you that the smallest possible box you can fit it in will reduce costs. You may want to remove the fork and zip tie it to the rear stays. Use bubble wrap or pipe insulation. I can't believe the bike you shipped me came through relatively unscathed.

There are a few threads on packing in the forum. One has pictures of a shipper from Europe and how he packs his frames.

What did you sell, a Merckx?