I can't recall I have ever gotten it either from Kunar.
About books in general, I know that you have to be at a certain level to get certain books. For example, you need to be level 11 to get level 4 books from Crock (I think).
And you need to rest 24 hours for the merchants to restock. It's a bigger chance to get the books if you buy alot of arrows/stones/quarrels to make room. Otherwise it's possible that those items take the spell-books space.
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