My three boys LOVE the Diary of a Wimpy Kid book series, and the newest book (released in November) “Old School” is only $5.64 (Reg. $13.95) on Amazon when you use promo code 25OFFBOOK at checkout. Code expired. 
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I tried to enter this promo code during check out and it says it’s not valid. I am not sure since I had another item if this had any affect
Bummer. Looks like the code expired. =(