The place you mentioned in Japan is called "Ikehabara". That's the lelong house or street for all frontier electronic gadgets. But let me warn you, if u buy from there, some things to take note.....
The place is where many electronic giant do their prototype test market. They design and build a new product and launch it there. If the review shown that the product is not doing well, they'll just not let it come into the open cionsumer market.
I previously bought a prototype Casio digital cam watch from there way before it launches the mass market editition in the current market. Guess what, qwhen I send it to Casio agent in Singapore for servicing, they said that they never have such a watch in their product database. So, they don't know how to service it.
So,...bear in mind the risk....