I just got into this show. I got the first season one disc at a time, from Netflix. Because this was too slow, and because I am a dirty thief, I torrented seasons 2 and 3. Because the torrent does not have subtitles and there's a lot of Spanish dialogue, I bought a legit copy of season 3 through Amazon video. Watched the last episode of season 3 this morning. Incredible show. Every episode is another moral line in the sand that's just few inches past the last one. It never seems like the situation has gone that far because it's so gradual, but it's really crazy now.
I hope season 4 wraps it up. I hate that I have to wait 2 and a half months for more!