Lego Batman Movie Promotional Cube – limited and hard to find – Anyone know more about this set?

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I saw this set posted on Facebook earlier today and I contacted the person that posted this as this is the first time that I have ever seen this set.   The poster stated that he saw this at a store in his area in PA and that it is for sale at that store.  The poster said he will get me a contact email for the seller and I will add this later.

I am not sure how many of these were produced or how they were distributed and I am very curious if anyone knows.  Please let me know.  I love finding out the details of these promotional items.  🙂

Thanks for looking