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Audible.com is running a great deal right now where you can download a free audio book. You can choose from over 100,000 books in their collection, and they have all of the Percy Jackson books. The 30-day free trial allows you to download one audio book for free plus get 30% off any other audio books that you might want to purchase.
Audio books are terrific for family trips, and the Percy Jackson audiobooks would be particularly great for all ages.