It's not that the coupons aren't valid for teen books; it's that they aren't valid for big publisher books and any list made in a bookshop, for young adult books probably even more so than adult books (if only because all in all, the selection is smaller), is quite likely to feature currently popular, well-displayed, hot-right-now books - books that people are talking about, books that are being turned into movies, books that friends have read and recommended.
And those books are far more likely to be big publisher books than small publisher books.
It definitely pays to shop around though - Kobo, if you cannot use a coupon, currently tends to be more expensive for a lot of books than other shops are.
If you do buy a book for her and she turns out to enjoy the e-reading experience, do consider the various price comparison sites and "wishlist" sites (where you can add all the books you're interested in and get e-mailed when the price drops). In the long run, this might well be helpful!
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