Alien vs. Predator (PC) for $8.99 at newegg. I think it was $9.99 during the Steam sale, but I may be wrong
http://www.newegg.com/Product/Produ..._-EMC-121410-Index-_-PCGames-_-32203027-L019B
http://www.newegg.com/Product/Produ..._-EMC-121410-Index-_-PCGames-_-32203027-L019B