Humble Bundle has some racing games in their current bundle.

[TShrimp]

I wasn't sure where to post this, but humblebundle.com has a bundle that includes WRC8 and TT Isle of Man. I also has some other games, but is $10 for everything. Part of your purchase goes to charity as well.

Humble Plug In (And Play!) Digital Bundle (pay what you want and help charity) (humblebundle.com) )