The Amazon MP3 Store offers downloads of one of 20 albums for $1.99 when you answer a question and share it on Facebook. That puts many of these albums well below what iTunes and Google Play charge, generally $9.99. (Many are all-time price lows.) Choose from Prince's "Purple Rain", Weezer's "Blue Album", Jay-Z's "The Black Album", "Simply Red 25: The Greatest Hits", and other less color-related albums.