Microsoft’s new Music Deals app offers the album for 90% less than iTunes (in the US).
Tay Tay's other album, "Speak Now," sold 1.05 million opening week and 2012's "Red" saw 1.21 million.
Get out that crisp dollar bill and buy it on Microsoft, or if you're feeling generous... there's always iTunes.
Recommended for you
Katy Perry Low-key Took A Dig At Britney Spears At The GRAMMYs... Twice
Lady Gaga Gets Massive Moth Tattoo Ahead Of Grammys
Katy Perry's "Chained To The Rhythm" Breaks Spotify Record
M.I.A. Claims Beyonce, Madonna And Rihanna Stole Her Sound
Iggy Azalea Wins GQ's Woman of the Year: "I Can Finally Say I Have An Award-Winning Vagina"