Can be purchased or rented on Apple TV, Amazon Prime Video, and Google Play Movies.
If you are looking for a specific from the film's score (which is often indexed in soundtracks): index of avatar 2
When the RDA returns to Pandora, Jake Sully must move his family to safety. Can be purchased or rented on Apple TV,
The RDA brings back specialized "recombinant" soldiers, including a Na'vi version of Colonel Quaritch (Stephen Lang), who holds the memories of the deceased human officer. Amazon Prime Video