www.gog.com
You must know the drill by now- classic games pre-tweaked to run on modern versions of Windows and completely DRM-free. Everything costs either $9.99 or $5.99, but from now until 2nd January those are cut down to $4.99 and $2.99
Fantastic titles like the Infinity Engine games, the Freespace series, Wing Commander series, Ultima series, Might & Magic/Heroes of Might & Magic series, Tex Murphy, Creatures, Longest Journey, Zork... there's loads of great stuff there, and it's all dirt cheap.
And until the end of Wednesday, you can get Empire Earth Gold Edition free just by being a member.
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"I'm Commander Shepard, and you're standing in the biggest library in Citadel Space. Look me up."