If you’re looking for a way to grab , it’s important to know that the game was officially delisted from digital storefronts like Steam in early 2017 due to expiring car and soundtrack licenses.
Here is a quick breakdown of the situation and how you can still play it: The "Complete Edition" Breakdown
Buying remaining Steam gift codes from third-party marketplaces (though prices for delisted games can be high). A Word of Caution