Do you like “The Dark Knight” movie? Are you planning on buying it? How about purchasing it online at Amazon and receiving a freebie? That’s right, Amazon is giving something for free for everyone that buys a DVD or Blu-ray disc of the new Batman movie.

Basically, you can buy the Blu-ray version for $23, or the 2-disc DVD for $20, and in exchange you can watch the same movie for free via the “Video On Deman” service from Amazon, which normally costs $15.

The Dark Knight Blu-ray

The Dark Knight DVD