I would like to sale my FX1 for a z5.
I am not sure what is the asking price for this camera.
Any suggestions will be appreciated.

If I need to sell something, my reference point is Ebay, it gives me an idea what the market value is.

Also check out the classified section here -- there are a bunch of FX1s for sale and that will give you an idea of what people are asking.

where is the classified?

For you to access the classified under community marketplace, you have to log in with your name and password, which I believe you have.