Second hand shops in Tokyo?

Please can anyone tel me where to find second hand shops for furniture and other small household items in Tokyo?

If you can find a HardOff store in the area they are a good source for second hand furniture. They are all over Japan.

-Where are the old laptop shops with low price in Tokyo? How much?
--Where are the MP4 shops with low price in Tokyo? How much?

Used laptop and other goods (such mp4 players, etc) can be widely found in Akihabara (Tokyo) and Den den town (Osaka). I canLt tell you about prices but they really vary depending on the computer or mp4 player youLre buying and the state; but I can tell ILve seen from laptops running on Pentium 2 processors to the latest Powerbook with only 1 or 2 weeks of use. If youLre from the US, prices may be cheaper in your country, as the dollar is quite weak at the moment, but if youLre from the Euro zone or the UK youLll find the prices amazingly cheap sometimes.

I know that one shop is near USA embassy. There a lot of furniture, matrass, sofa bed and etc.

Yep, the furniture shop near the U.S embassy is called May's.
They have used and new furniture and other interior nick-nacks.
This is the URL www.mays-furniture-rental-tokyo.com