questionswould it be smart to buy extra mw3 hardened…

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No they are only sold out online and there will be plenty to buy at stores everywhere on Nov 8th. Those eBay sellers and others are only selling to people that wanted the game shipped to them and received on the 8th, this all happened a couple of years ago with MW2.

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I ended up selling my MW2 Hardened Edition for 10 bucks more than I originally paid for it six months ago. This was because the Zombie maps that came as an "exclusive" with it were never actually released (at the time) to the general public so the value actually went up!

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If your a CoD fan and plan on buying the DLC then yes.
If you play CoD casually then no.