EA has announced they are dropping support for the Sims 2 and are making it free on Origin.
Just redeem the code I-LOVE-THE-SIMS on Origin. This collection includes all the expansion packs as far as I can tell.
One problem I ran into was that the game doesn't recognize my video card and stuck the resolution at 800 x 600. Here's the fix allowing you to increase resolution to 1920x1080