[sinanspd]

For very expensive items, I get custom cases made. Good quality, strong wood case with a slide out door so I can display in the case. Fill the case with foam with a cutout in the item's dimensions, then I sow velvet/silk fabric on the foam which doesn't leave any marks on the item. It is expensive, they are heavy but for one of a kind items, it is worth it. For everything else I second the link Ozzy posted