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Episode one is completely free. The other four episodes are on sale for half off (only 200 points instead of the usual 400). That means you can get the entire series for $10, when it usually costs $25 (or $30 if you get the physical copy).
You have to download every episode by itself though. On the main page on the dashboard you'll see the Countdown to 2013 event. Click that and you'll be able to find today's deal with all the episodes.
Please note that episode one will be free all week, though the other episodes will only have their deals running today.