There's a place @Downtown that sells them. It's a side shop by the street run by an old man! everything is tied up in a big bundle, it's truly incredible how many great finds you can get your hands on!
the cheapest books you can find are found @Downtown there is a book shop near Habiba sweets and another next to mostwanted media store. The books are 3-5 jd's
@Downtown there is a shop near the traffic light, beside most wanted store media, he can take the books you have and sell you any of his books for half the price.