100 Yen Shop as Souvenir Shop
I recommend you to go shopping at 100 yen shop "Hyakuen Shop" which sell at basically 100 yen a wide range of products such as tableware, kitchenwares, toys, gardenwares, stationaries, household goods, leisure goods etc. You may find a small nice item for your friends and family as souvenirs. There are many 100 yen shops all over Japan. One of major 100 yen shop group is "Daiso" and you may find it easily anywhere.