you would have to figure it out after they said they were interested in it. because you would need their address, and how they want it shipped, and how fast. then you would add up the shipping - and a handling charge (for yourself, the time it took, the wrapping of it, insurance, etc). and then tell it to them. you can only do a universal charge if your going to ship a lot of things. or you choose the higher of the prices and use that as a default. but i'd ask first then get it. otherwise you may be sending this to japan on your dime (if you set up a default price).
---Mike Savad
MikeSavad.com