Popular Websites in Japan :

http://auction.yahoo.co.jp/

-------> The biggest auction website in Japan (almost all kinds of items new / used)

http://www.rakuten.co.jp/

-------> Website for fashion items (clothes, shoes, jackets, purses, pants, etc.)

http://kakaku.com/

-------> Website for new electronic items (camera body, lens camera, laptop, etc.)

http://kakaku.com/

-------> Website for the auction item (most items new / used)

http://www.garagelive.jp/

--------> Website for auction items (spare parts car)

http://zozo.jp/

--------> Websites for specific fashion brand goods Zozo (shirt, pants, jackets, etc.)

http://www.uniqlo.com/jp/

--------> Websites for specific fashion brand Uniqlo items (shirts, pants, jackets, etc.)

http://www.amazon.co.jp/

--------> Website for different types of goods (toys, electronics, musical instruments, books, etc.)

http://www.cdjapan.co.jp/

--------> Website to CD / DVD Music (to look for the CD / DVD Limited Edition)

http://www.hlj.com/

--------> Website for toy (Action figure, cards, model kits, etc.)

http://www.otaku.com/

--------> Website to CD / DVD Music and books (to look for the CD / DVD / Books Limited Edition)