Amazon.com has a great selection of $5 Albums available as MP3s to download to your computer or iPod. This is the only way I buy albums anymore; their prices are almost always better than iTunes.
I just bought Katy Perry's Teenage Dream album. I'd been wanting it for a while, but now's the chance to get it half the original price!
Here are some popular ones to choose from:
I'm Wide Awake, It's Morning by Bright Eyes
The Fame Monster by Lady Gaga
Need You Now by Lady Antebellum
Teenage Dream by Katy Perry
Some Hearts by Carrie Underwood
The Everglow by Mae (an absolutely FAVORITE of mine...one of my favorite albums ever)
Heavier Things by John Mayer
Treats by Sleigh Bells