Just got this in my e-mail. There was a list associated with it, but I was able to use it on a mystery book that was not on their list - a non-agency one, of course, but one that wasn't on the list.
I don't know if this will work for anyone else, or if it is tied to my account - hopefully someone else can try it and see.
Mystery eBooks just for you at 50% OFF!
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Hurry! Offer expires on November 7, 2012 at 11:59 PM EST.