The Feb. 1 week's official sales figures, as compiled and collected by Nielsen and used for Billboard's charts, will be released on Feb. 4.
Elliott performed a medley of three tunes during Perry's halftime spectacular: "Get Ur Freak On," "Work It" and "Lose Control." They are each aiming to sell around 15,000 to 20,000 downloads for the week. In the previous week, each sold around 1,000 downloads, according to Nielsen.
"Work It" looks to be the halftime show's biggest seller, as it may shift around 20,000 downloads.
Perry's biggest-selling song of the week could be "Roar," which opened the show, as it may sell around 17,000.
Perry's collected songs could sell over 100,000 -- gaining perhaps 75 percent compared to the previous week (57,000).