Arakas, buy from
Fali &
Yolak (125 GP), buy from
Ttayh Mark (Black Market) (183 GP) / Raven Dust, buy from
Boreas (125 GP) / Stoneheim, buy from
Chryseida Yolangda &
Kwarlgloth (125 GP) / Dropped by various monsters and found in chests (in all islands)