title_body: Is it possible to send a book purchased from Amazon to all of my devices at once?
upvoted_answer: According to the Kindle support forums, after purchasing a book, you will be presented with an option to send the book to additional Kindle devices. You will need to do this for each of the devices you would like to send the book to - there is no option to send it to all of them.
  
  Also, keep in mind that most books limit the number of devices that they may be downloaded to - therefore sending a book to more Kindles than the book allows would be impossible anyway.