I found a survey site where I can make small amount of money. I have never tried it before, so not sure but if you want to try, the following is the web site of the company.
The followings are the company’s pitch, for your reference.
You can Earn Pocket Money at Your Free Time!
e-gaikokujin Recruiting provides foreigners with opportunities to take part in paid survey work for Japanese and foreign companies.
Due to the fantastic response we have had from the foreign community and the quality of work being carried out, we are receiving more and more requests for foreigners to participate in survey.
We have assisted a growing number of leading Japanese companies, and product testers have been involved in everything from in-house testing of websites and mobile Internet platforms, to crash testing laptop computers.
Foreigners registering for our service include everyone from company managers, Tokyo University students and software engineers, to Web designers, teachers and housewives.
Of course, all work is paid (extra pocket money or cash for shopping for that special weekend away!) and many foreign participants have been coming back for more.