Mortal Kombat and Portal 2 Now Only $40 on Amazon

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It has only been a month since Mortal Kombat was released and at least one site has it marked down $20. Amazon.com is selling Mortal Kombat for $40 on both PS3 and Xbox 360. The same can be said for Valve’s Portal 2 on PS3 and Xbox 360, although the PC version is only $30.