Watch out for warranties. You will have to ship back to Japan and back to you and pay a lot of shipping charges. Probably not worth it unless the item is over $1000. I have lost a couple of items (a tape recorder by Panasonic and a headphone by Sony) because the warranty was only good in Japan and the cost of shipping both ways was too high. I would suggest use Amazon if available, it may save you money in the long run.
Unless you get a DOA warranty (not likely).