* Hulu: This is the best option if you want to watch the entire series legally and in high quality.
* Crunchyroll: This is another popular streaming service for anime, and they have all of Naruto Shippuden.
* Netflix: Depending on your region, you might find some episodes of Naruto Shippuden on Netflix.
It is important to note that these streaming services often have subscription fees. You can check their websites for details on pricing and available content.
It's also important to remember that the availability of content can change over time, so it's best to check the streaming services directly for the most up-to-date information.