【100 yen Shop】
100 yen shop is a kind of store that sells a variety of products for 108 yen (100 yen plus 8 percent consumption tax). There are 6 shops in Shinjuku area and the biggest one is located in Shinjuku West exit, about 10 minutes walk from Shinjuku Washington Hotel.
My recommendation for tourist is to buy goods that can represent Japanese culture, like Mount Fuji, sushi, ninjaa etc. It is also one of the best place to find souvenir in here.