Just to let everyone know if you are looking to participate in the Dirt Showdown tourney, there is a seller on ebay that is selling Dirt Vouchers for Steam for $6. It's the cheapest I've seen the game go for and the seller is very reliable. My brother and a friend bought from him and received their voucher codes shortly after purchasing their codes via email. Both have activate and installed successfully. Link below.
http://www.ebay.com/itm/Dirt-Showdown-PC-Game-Steam-Voucher-Code-Key-Card-/300806396026?pt=LH_DefaultDomain_0&hash=item460975587aGood luck at NeXus everyone!