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I'm pretty sure I've seen them in Family Mart and 7&i.

http://www.smbc-card.com/prepaid/brand/guide/index.html

SMBC apparently has them, too.

Thanks a lot! This will be incredibly helpful to me :-)

Also apply online for the Rakuten card, and try applying for the store card at Marui. Also if you have an account at Shinsei try to get their credit card.

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