Avatar remained at the top of the video sales charts for the fourth week in a row last week, but three films that did mediocre business at the box office topped it on the rental charts. According to Home Media magazine, the 20th Century Fox blockbuster was the top seller on both the Nielsen VideoScan First Alert and the dedicated Blu-ray Disc sales charts. But it was topped on Home Media 's rental chart by Edge of Darkness, Legion, and Daybreakers. Avatar fell to fourth place after holding the top spot for the previous three weeks.