So for today only, Fallout 3 is $4.99 On the Xbox Live Marketplace. So if you're deciding on whether to buy Fallout 3 or New Vegas, Id definantly check out Fallout 3 first as it was a lot better than New Vegas (My opinion) and will allow you to get a taste of Fallout if you plan on buying New Vegas or Fallout 4 after. Also check out the DLCs for Fallout 3, if you are going to buy one, id go for Broken Steel as it allows you to carry on after the main questline has finished.

Note: This deal is only available today on Monday 4th of March.

Proof:
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Fallout_4