I found b-mobile S offer for 7GB/ 25days/ 2980yen
http://www.bmobile.ne.jp/sb/plan_pre.html on bmobile website
Is this prepaid SIM available in any stores, or only online? is there a website in English for this offer, my Japanese is not good enough to read all details
Another offer is 7GB/ 1 month/ 3500yen+tax
same question, can i buy it at an airport or yodobashi like stores?
Alternately can you point me to an offer that is minimum 24days and is under 3500yen? 2GB data is enough for me.