20th Century Fox is reportedly close to finalizing a deal to sell the commercial TV rights to Avatar to sister cable network FX. According to the LA Times, the price tag on the movie could be more than $25 million for a multi-year viewing window.
Generally, the purchase price in these deals is around 12% of the domestic box office with a cap. The cap is necessary in situations of blockbusters such as Avatar. In the case of Avatar, LA Times hypothesizes the cap is somewhere north of $200M.