Why are the NVIDIA GeForce 6800 Ultra and the Radeon X800 XT Platinum Edition so expensive and hard to find? I am willing to drop 500 or so on a new video card but I am not willing to pay a mark up of over 600 for them. I have checked everywhere mostly they are out of stock or marked up to 8 billion dollars. So guys I ask for your help in finding one of these beasts.