Price wasn't that bad in EU (all things considered)
Well, I wouldn't say that 400€ was a good price (at the time I got it from the USA at 250 shipped, and keep in mind that it was even cheaper outside of ebay).
Officially the n810 is still 400€ here......
I just started the exact same problem with the screen vibrating and scrolling. Is there a solution to this? My N800 is a couple of months over a year old.
The only known solution is to replace the screen. Maybe a nokia service center could perform a less expensive repair but I doubt it (labour isn't cheap).