When living in a developed country.. or put correctly, a country with huge population... you MUST take advantage of the marketing effort of various companies giving out free samples to potential customers. Apart from the common pocket tissues and clear files distributed in crowded areas, you might want to check out sites like samplefan.com where they compiled information on what's currently being given out for free. Some does require your time to fill out questionnaires or become a member of their community site, but that's such a small matter when they are giving out 2000yen coupon in return.
Another way to get free stuff is buy buying magazines. Japanese women's magazine often give out branded small bags etc. and you're only paying 600yen for it.