Requirements: Dark Elf Armor (or Fine Nickel Armor), Ravensword (if you beat the game, if not, use gem sword and turn difficulty down), unlocked the wasteland and found the third ravenstone. After killing the Dark Elf Prince, collect all the bows the dark elves have and leave. Re-enter and kill the dark elves and take their bows. Each bow sells for 645 or more at the store. Repeat this as many times as needed.