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I don't know of any 100 yen shops in Shibuya. If you are looking for a shop in Shinjuku you have to look hard. It's best to look around Zara's. If you really want a great 100 yen shop and you don't have to go far to find it go to Harajuku. Take the Takeshita Dori exit. Takeshita Street) Cross the street, keep straight. You will pass a Lotteria hamburger shop on your left. On your right will be a Wolfgang Puck. Keep straight and you will walk into Daiso on your left. It's about 4 floors of cheap shopping heaven.