Fang,
Not sure about cost but I have a good packing idea for you. My buddy mailed a NOS set of CBX pipes to France and they arrived in perfect condition!!
1- Wrap parts in cloth to protect from chemical heat. 2- Spray in "great stuff" foam from home depot and cover with heavy plastic, let it expand and set parts in before it solidifies so they sink in slightly. 3- Cover with heavy plastic and then more foam, let expand to fill box and seal up. 4- Mail away!!
HB