My friend in Arizona gave me her Bernina, we bought a used box from the dealer that included all the padding and inserts they use when they ship back to factory. I would recommend calling a local shop and seeing if you could get something similar.
Between box, insurance and postage (we went US mail for a number of reasons) it was not cheap, but it is a huge heavy machine, I think about $300 total. ($100 for the box/packing supplies and $160 postage, about 2 years ago). The machine still sells used for around 3k, so figured it was reasonable.