Take a look at this thread HERE.
GameFaqs
You need the Ad from Toys R' Us and take it to best Buy as proof. Once done, you can get the game 20$ off. I checked myself with my local Best Buy.
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I am, Forever Gone.
“I am become Death, the Destroyer of Worlds”
Who is 'we' and where was this stated beforehand?
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I am, Forever Gone.
“I am become Death, the Destroyer of Worlds”
you can get it for 20$ at Game Stop 
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Counter Clock Wise wrote:
you can get it for 20$ at Game Stop
By trading in 2 games.
__________________
I am, Forever Gone.
“I am become Death, the Destroyer of Worlds”
