Buying an extra Guitar Hero 3 guitar controller for PC?

The driver I have now has the little green Xbox logo that glows in the you see on the Xbox controller, which means you can buy the guitar controller work with my Xbox360 and PC version of Guitar Hero 3? Moreover, Does anyone know where I can buy an extra Guitar Hero 3 PC (or Xbox 360 does work with the PC game), guitar controller?

I have heard that the drivers are not different from each other, and can use the 360 with the PC. We also know that the spare drivers just out for $ 70 I am not sure whether or not you can buy enacted specific PC controller though.

XBOX 360 logo

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