Where can I buy a nano SIM cutter in Tokyo?

I'm currently living in Japan but brought an unlocked iPhone 5 with me from the United States. I wanted to get a b-mobile data-only SIM card for my phone but they do not sell it in the nano SIM card size. I know I won't be able to get LTE with my iPhone 5 but I'm willing to get 3G as long as it means I get any data. Does anyone know where I can buy a nano SIM cutter in Tokyo as well as sandpaper?

This is it on Amazon Japan.
http://www.amazon.co.jp/gp/product/B009DFL0HA/

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