The complete Cirque du Freak/The Saga of Darren Shan series by Darren Shan! All books are brand new in paperback format. The series includes:

Vampire Blood Trilogy
1) Cirque du Freak
2) The Vampire's Assistant
3) Tunnels of Blood

Vampire Rites Trilogy
4) Vampire Mountain
5) Trials of Death
6) The Vampire Prince   

Vampire War Trilogy
7) Hunters of the Dusk
8) Allies of the Night
9) Killers of the Dawn

Vampire Destiny Trilogy
10) The Lake of Souls
11) Lord of the Shadows
12) Sons of Destiny