You should easily be able to find abandonware sites that offer them. Since you have legitimate copies for other systems, you don't even have to feel bad about it.
You can also find a legal copy of X-COM 1&2 on Steam. The games run in DOSBOX, so it's easy to copy all the gamedata files, since they are not copy protected:
X-COM: UFO Defense
http://store.steampowered.com/app/7760/
X-COM: Terror From the Deep
http://store.steampowered.com/app/7650/
Perhaps the X-COM complete pack is a better deal, since you get all 5 X-COM games for roughly three times the price of a single game (depends on your region)
http://store.steampowered.com/sub/964/
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