This week at both Wal-Mart and EB Games Canada sees a free copy of Darksiders 1 being given away with the purchase of Darksiders 2, along with a blast from the past in a Buy 2, Get 1 free deal on all used Gamecube, Game Boy Advance, or Game Boy Colour games.
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:)
You will get the first three dlc packs, along with a free upgrade to the limited edition (which is what allows for the first dlc pack). You can get the original game for peanuts nowadays anyway.
Not to mention buying from the store will help better support THQ. They need all the help they can get right now.