This month, Amazon is offering an 50 albums for $5, and over 500 free songs as well...

In addition their deal of the day is:

99 Most Influential Vivaldi Masterpieces.  Available for $2.99 today (reg. $7.99).

All Amazon MP3 purchases are play anywhere, DRM-free, so you have complete freedom to copy/move all of your music to your devices without hassle.  In addition, all songs/albums are all compatible with iTunes and Windows Media Player.

Check it out:  Amazon MP3 Store Specials