Amazon is launching a new subscription service just for kids.
Its called "Prime Book Box" and will deliver a box of discounted books for $23.00.
Parents can select the age group they're buying for when they subscribe. The books are divided into four categories -- birth to 2 years, 3 to 5, 6 to 8 and 9 to 12.
Right now its only available for Prime members who get an invitation.
