Dear Brother and Sister in Islam,
Quran is the book of Allah that is revealed on to our beloved Prophet, the best creation of Allah, Mohammad (Sallallahu Alaihi Wa SAllam).
Quran cannot be for sale, but here the intention would be for the cost that is associated with the printing and paper. Certainly, paper and the printing material does cost, but the wording are from the Creator of all creation and cannot have any cost associated. We should request the bookseller to change the term "price" to "hadiya".