Amazon is offering Buy Two, Get One Free MP3 Albums right now.
There is a wide variety of genres and artists to choose from. I see U2, Maroon 5, OneRepublic, Katy Perry, Sublime, Elton John, The Police, Train, The Avvett Brothers, The Lumineers, Casting Crowns and many more.
Prices range from $5.99 – $9.99 per album.