If you haven't played them, I highly recommend it. You can get all 3 for $10. Expires on 3/8. I have never purchased games from that site though, so proceed with caution if you do.
http://slickdeals.net/f/7705553-mass-effect-trilogy-1-2-3-pc-digital-download-10-20-via-gamersgate
http://slickdeals.net/f/7705553-mass-effect-trilogy-1-2-3-pc-digital-download-10-20-via-gamersgate