Carrie Underwood’s “Play One” : 844,000
Daughtry’s “Leave This Town”: 806,000
Kelly Clarkson: “All I Ever Wanted”: 784,000
David Cook: “David Cook”: 451,000
Carrie Underwood: “Carnival Ride” 432,000
Adam Lambert “For Your Entertainment” 296,000
Daughtry, “Daughtry” 241,000
Jennifer Hudson “Jennifer Hudson” 234,000
Carrie Underwood “Some Hearts” 224,000
Kellie Pickler “Kellie Pickler” 199,000

http://content.usatoday.com/communities/idolchatter/post/2009/12/carrie-underwood-leads-2009s-best-selling-american-idol-albums/1

I have Carrie Underwood's first two albums. They really are good. I don't bother buying CD's anymore, unless I like at least 90% of the songs on them.

David Archuleta's Christmas album also sold 210,000...IDK why its not on the list, maybe cause it was a Christmas album.