Amazon music sale: $1.99 MP3 albums (and how to get one free)

Looking to stock that iPod with some new tunes? Amazon has some downright unbeatable deals on some downright decent (in some cases excellent) albums.
For a mere $1.99, you can snag any of the following:

• "Band of Joy," Robert Plant
• "Battle Studies," John Mayer
• "Dark Side of the Moon," Pink Floyd
• "High Violet," The National
• "Hurley," Weezer
• "Kaleidoscope Heart," Sara Bareilles
• "Power to the People - The Hits," John Lennon
• "The Fame Monster," Lady Gaga
• "The Suburbs," Arcade Fire
• "This Is Happening," LCD Soundsystem
• "Transference," Spoon
• "xx", The XX
• "You Are Not Alone," Mavis Staples

At least some of these (including John Mayer and Pink Floyd) are on sale today only, but they'll be replaced tomorrow with at least five more $1.99 albums.

So, how can you score one for free? Turns out the Get $3 in MP3 Downloads deal I mentioned the other day is still running. You can apply that $3 credit to any of these albums--and still have a buck left over!