You'll need a 40' container and also will need to remove at least one main landing gear leg. Costs for packaging/crating and installing in the container can range from 2000-5000 USD depending on the aircraft.
If you intend to register on other than the N registry, you'll also need an export certificate of airworthiness.
There are many considerations so you will want to talk with a firm who is accustomed to completing these transactions.