I recently purchased The Witcher because I'm just about done with F3 until a CS or DLC is released, and so I wanted to know more about the developer (CD Projekt RED) because it looks as though they slaved away making the game. Anyway, I learned that they run a site called gog.com (stands for good old games) and here you can download a lot of old classics including the Fallout franchise. The prices are very reasonable at $5.99 each and they include a lot of bonus content.
Here they are at http://www.gog.com/en/page/fallout_promotion/.
Even I get tempted with older games because they can be hard to find, but this destroys any excuse to pirate them. I will be downloading at least 2, maybe 1, but not Tactics because it's non-canon.