Kindle fire is used worldwide by its users and can be taken anywhere in the world. But due to security reasons or privacy of the content, it is geographically restricted. The content which is allowed to be read on kindle fire in the US may not be possible to read in other countries as it has changed its location. In the same way, this content cannot be accessed in the US due to copyright restrictions if it is not bought over there. The price of the items gets changed as you change the location on the Amazon website.