Rumour has it from Semiaccurate that as of today, there are precisely 200 GTX480 and GTX470 in the whole of Europe for sale. Whether that is a 50/50 split so there are 100 GTX 480's, who knows.
This rumor is incorrect. Semiaccutate stated that two of Nvidias minor AIBs had 100 cards each for europe, but thats not including the other AIBs. Asus / EVGA and other major ones would recieve a lot more.
They said that the total number of Fermis available on launchday worldwide would be 8000.