I'm definitely in the camp that would rather pay 90 bucks for a full game with all the DLCs and everything unlocked rather than pay 60 bucks at launch and 30 down the road for everything else.
I certainly wouldn't know anything about it, but if i had to make a blind guess: Torrentz2.com, have uTorrent installed and click magnet links to download through uTorrent.
https://goo.gl/AJJ4Ux
As of now, it's at -676k.