update: I found a shop with a second hand n900.
It seems in good conditions, it has only one scratch on the screen (around 1 cm) but I probably I could live with it. It comes with n900, battery, a simple usb cable, and the charger. I think it lacks of original headset, the usb cable with two jack (micros usb and mini nokia?), tv cable, and I don't know what more. All that at 270 euro. What do you guys think? Is it a good price? Do i need some sofware disk for delete everything from old owner and have it like new?

I should go to another shop on Monday where probably have more devices available.