Some websites that give information on travelling to Japan on the most cost effective ways of surviving in Japan:-
http://www.bugbog.com/exotic_places/japan_travel.html
http://www.fco.gov.uk/en/travelling-and-living-overseas/travel-advice-by-country/asia-oceania/japan
http://www.worldtravelguide.net/country/131/travel_advice/Far-East-Asia/Japan.html
http://www.attitudetravel.com/japan/
http://www.virtualtourist.com/travel/Asia/Japan/TravelGuide-Japan.html
http://www.viator.com/Japan/d16
http://www.geocities.com/traveljapaneasily/jpta.html
http://www.gaijinpot.com/resources_l.php