 
  What Other Have Translate
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  Sadly, no math books for sale. 
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  Above commenter. What's wrong with the math. The sentence means if you buy 2 books you get 1 book for free. So there are 3 books for you but you only have to pay for 2. That's not the irony. The irony is that this is a book store and their English sucks ass. Get it? You know. Book store and all. 
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  Cool Story Bro 
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  And I total can get +1 thumbs up. 
 
    
  
Sadly, no math books for sale.