Hope this would help ...
price's drop from time to time though 
Mystery Mastery book -> 1,7m
Maple Warrior 20-30 -> 35m-140m
(Thief Related)
Dual Wield Expert30 -> 45m
Thorns30 -> 15m
Blade Fury30 -> 20m~
Dagger Expert 20-30 -> 1m-2m
Cane Expert 20-30 -> 3m-9m
(Warrior Related)
Demon Cry 20 -> 30~30mill
Demon Impact 20-30 -> 20m-20m
Expert Sword Mastery (Kaiser) 20-30 -> 25m-35m
Nova Warrior (Kaiser) 20-30 -> 12m-15m
Gigas Wave 20-30 -> 15m-20m
Grand Armor 20 -> 5m
UnBreakable Will 20-30 -> 10m-10m
Blade Burst 20 -> 12m
(Mage Related)
Advanced Yellow Aura 20-30 -> 5m-10m
Advanced Dark Aura 20-30 -> 3m-10m
Advanced Blessing 20-30 -> 3m-5m
Reflection 20-30 -> 20m-25m
Arcane Pitch 20-30 -> 10m-12m
Magic Mastery (Lumi) 20-30 ->15m-20m
Dark Crescendo 20-30 -> 10m-15m
Finishing Blow 20-30 -> 5m-15m
(Pirate Related)
Nova Warrior (Angelic Buster) 20-30 -> 2m-3m
Cannon Bazooka 20-30 -> 2m-5m
(Bowman Related)
Sharp Eye 20-30 -> 2m-5m
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Like i said before price's drops from time to time.. i'll try to keep up editing with the recent price's and keep adding books day by day 
