GOG has Metro Franchise Bundle (PC Digital Download) on sale for $9.51.

Bundle Includes:

• Metro 2033 Redux
  • Man has fallen, struggling to survive within Moscow's metro. In the face of a new mysterious threat young Artyom must leave his home station for the first time, making a dangerous journey to the legendary Polis to enlist their help.
• Metro: Last Light Redux
  • Following the events of Metro 2033, Artyom, now an experienced ranger, confronted with guilt must go on a journey to face threats from outside the metro and within, as he finds out that he is humanity's last salvation for peace.
• Metro Exodus
  • 26-year-old Artyom, flees the Metro in Moscow and sets off on a journey through the harsh nuclear winter in Russia.
• Metro Exodus: Sam's Story DLC
  • Players will forge Sam's path through the sandbox survival landscape of Vladivostok, as they take a brand new journey across the wasteland of post-apocalyptic Russia.
• Metro Exodus: The Two Colonels DLC
  • Following the journey and experiences of Colonel Khlebnikov during the last days of life in Novosibirsk, retraced by Colonel Miller a year later.