I would buy it from http://www.gog.com/en/gamecard/fallout, and download the installers to a flash drive, then take that to your gaming computer. These need no internet connection.
The only reason to buy a boxed set for Fallout is if it actually contains the spiral bound printed manual ~and I if could find that, I'd have already bought it for myself.
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While you were at it you could download the user patches as well ~it should all fit on most flash drives these days
http://www.killap.net