Ship it in a case (of course) inside a surdy cardboard carton. The carton should be at least 1 in. bigger than the case in all dimensions. Use polystyrene chips or bubble wrap to space the case from the carton all around.
Based on my experience the preferred shipper is Fedex. UPS is ok. DHL is awful. This is based on a combination of administrative ease and damage to goods on maybe 50 shipments over the years,