Before Amazon became the go-to place to buy literally anything you want, the company made a name for itself largely by selling physical books. Now, the online retail giant has a neat new service in keeping with its history: Prime Book Box is a subscription plan that will send you a box of either two or four child-friendly books every one, two, or three months for $22.99 per box—at a savings of "up to 35% off List Price."
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