The Amazon MP3 store's "March is Metal Month" promotion, which runs all month long, has launched today, and literally dozens of head-crushingly heavy Roadrunner titles are on sale for $3.99, $4.99 or $5.99. Check out the list below, and fill your collection with killer metal and hard rock!

Black Stone Cherry: Black Stone Cherry, Folklore & Superstition, Between the Devil and the Deep Blue Sea
Coal Chamber: Coal Chamber, Chamber Music
Deicide: Deicide, Legion
Devildriver: The Last Kind Words, The Fury of Our Maker's Hand, Beast
Fear Factory: Obsolete
Gojira: L'Enfant Sauvage
Killswitch Engage: Alive or Just Breathing, The End of Heartache, As Daylight Dies, Killswitch Engage
King Diamond: Abigail
Machine Head: The Blackening, Unto the Locust
Megadeth: United Abominations, Endgame, TH1RT3EN
Sepultura: Chaos A.D.
Slipknot: Slipknot, Iowa, Vol. 3: The Subliminal Verses, All Hope is Gone, Antennas to Hell
Soulfly: Enslaved
Stone Sour: Stone Sour, Come What(ever) May, Audio Secrecy, House of Gold & Bones Part 1
Times of Grace: The Hymn of a Broken Man
Type O Negative: Bloody Kisses (Top Shelf Edition), October Rust (Special Edition), World Coming Down, Life is Killing Me