Bundle containing the following 6 games + 1 DLC; Dark Sector (does not show up on the Steam website) GTR Evolution (Steam, $7.99) - this includes the base game Race 07 Space Pirates and Zombies …
IndieGameStand has SPAZ (Space Pirates and Zombies) on a pay what you want deal. Minimum price is $0.25 for DRM free or $1 for a steam key. Pretty fun game which I've played through to completion.