Where is the nearest 100-yen shop?

Near Shinjuku Station (Seibu Shinjuku/Shinjuku Prince Hotel).  There is a department store called Pepe, and on the 8th floor of that building is a 100-yen shop called Can-Do.  It has a decent selection and one of the checkout lanes can handle credit card transactions as well. (Many 100-yen shops don’t take credit.)