100yen shops are easily found across Japan with variety of products all at 100 yen! (*selected items are at 200yen or more). Here are the list of popular 100yen shop retail chain in Japan.
DAISO : www.daiso-sangyo.co.jp
CanDo : www.cando-web.co.jp
Seria : www.seria-group.com
Lawson Store 100 : http://store100.lawson.co.jp/