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I'm not sure about down there, but places like Juntendo, Nafco, Comeri, Conan--like a hardware/lumber store. They also have furniture...

I ordered my Naniwa stones from here, they have free...

Give me your Japanese address, and I'll ship you something to check! :D

**EDIT** Also, as you are in Japan, I would recommend going with Shapton or Naniwa over Norton simply because you can...

Hey Mate, I'm up in Honshu. If there's anything I can help you with, let me know.

Is it tough to get stuff to an APO, or do you have a Japanese address?