If you're a fan of Bioware games (and you should be), and you purchased a copy of Dragon Age 2 (and you should) then you qualify for a free ($0.00) copy of Mass Effect 2 for the PC from the Bioware site.
Yes, free. True it's a game you should already have, but in case you don't, then now you can get it for the low price of nothing, if you already bought another game you also should have.
I'm probably not selling this the best, but just head over to social.bioware.com/me2offer and enter the online pass for the Black Emporium DLC that comes with the new game.
Yep, that's right, you have to buy a new copy of Dragon Age 2.