As one of its daily deals, the Amazon MP3 Store
offers downloads of 20 MP3 Albums
each. That's among the best sales we've seen on MP3 albums from Amazon recently, yielding many price lows. (For further comparison, we saw a selection of MP3 album downloads for $3 each two weeks ago, since expired.) Amazon MP3 Downloader is required. Deal ends today.
A best bet is downloads of Muse's The 2nd Law MP3 Album (pictured) for $1.99. That's $2 under our January mention and still $2 below the best price we could find for this 13-track, DRM-free rock album, originally released in September 2012.