Available today on DVD and Blu-ray: director Alex Gibney explores the rise and fall of New York governor Eliot Spitzer in Client 9; Chloe Moretz and Kodi Smit-McPhee star in the horror remake, Let Me In; two people try to survive an alien wasteland on Earth in the drama, Monsters; plus a look at Never Let Me Go, starring Carey Mulligan, Keira Knightley, and Andrew Garfield.