Physical Copies:
* Libraries: Most libraries have a wide selection of Rick Riordan's books.
* Bookstores: You can find his books at bookstores like Barnes & Noble, Books-A-Million, and independent bookstores.
* Online Retailers: Amazon, Target, Walmart, and other online retailers offer a wide variety of his books.
Digital Copies:
* E-readers: Amazon Kindle, Nook, Kobo, and other e-reader platforms offer digital versions of his books.
* Online Libraries: OverDrive and Hoopla are popular services that allow you to borrow digital books from your local library.
Audiobooks:
* Audible: Audible is a popular platform for listening to audiobooks, and they have many of Rick Riordan's books.
* Other Audiobook Services: Other services like Google Play Books and Apple Books also offer audiobooks.
Note: Availability of specific books may vary depending on your location and the platform you are using.