Each Book Bundle costs $18, with no additional shipping cost if it is purchased together with your Play Kits Subscription. A shipping fee of $5.95 applies if the Book Bundle is purchased separately from The Play Kits Subscription (a shipping fee of $9.95 applies if in Canada). Each Bundle includes at least two titles, in addition to the books that are already included in The Play Kits. Each Book Bundle includes stories that were specifically written for the developmental changes your child is experiencing at that stage.