avatar_dvdJames Cameron’s Avatar retail sales (not including rental sales) have reached 19.7 million Blu-ray disc and DVDs combined worldwide by its third week in release, according to 20th Century Fox Home Entertainment. (By comparison, The Dark Knight sold approximately 16 million units worldwide on Blu-ray and DVD combined in its 3rd week.) Internationally, Avatar displaces Harry Potter 5 as the biggest selling title since the launch of DVD. Meanwhile, its Blu-ray disc sales are at 6.2 million – – more than double the industry standard for the high definition format. Avatar is now the biggest Blu-ray release of all time worldwide with no sign of slowing down.