Gran Turismo 5: Prologue sells 4.17 million copies.

[Hus]

letsdance said:

MontanaHatchet said:
They're likely including digital copies. Well done nonetheless, I'm sure that was a big money maker for Sony and PD.

3:1 Hard copies to DD  seems really high in my opinion.

DD is a nice option though, as long as you get online you can download whatever GT version is available for sale.  You arent stuck with whats for sale in your domestic retail.