Theses numbers are on spot with this thread:
http://gamrconnect.vgchartz.com/thread.php?id=120311
[PS3] Gran Turismo 5: The Real Driving Simulator (SCE) 500.000 (80% 1st Print Edition)
400k shipped standalone copies = 350k sold
More others 100k shipped bundled = 80k sold
AMAZING SALES FOR GT5 = 430k FIRST WEEK!!!!