Get GRID 2 plus 2 DLCs for free from the Humble store. Only 2 days and 15 hours left at time of writing and only “free while supplies last”.
The two DLCs are the Bathurst Track Pack and the Spa-Francorchamps Track Pack. With these packs you also get these cars: Nissan Skyline GT-R Group A (R32), Ford Sierra RS500, a Ford Racing Ute, Aston Martin V12 Zagato (N24) and BMW Z4 GT3.
The Demolition Derby Pack DLC is also free on Steam which is a bonus.