Originally Posted by ChrisA 
The K10D body is available here in the UK from a reputable shop for £400, brand new, with warranty. Your 500 euros is about £340.
Can't speak for other EU countries, but to sell it in the UK it would have come down some more, I suspect.
GBP 400?
Then I can consider to go lower. I do notice that Ffordes wants GBP 550, Pixmania wants GBP 509, the lowest price at anyone having the camera in stock is Tesco (GBP 499.97, according to Pricerunner). It seems as you can order the camera from a place called Tekmo for GBP 419 plus shipping, unknown if in stock.
What reputable dealer sells it for GBP 400? I'm surprised as this would be the first time anything Pentax in GB is priced that competetive.
regards, and
thank you,