Maplestory: Scrolls Guide
Bosses - they do not drop any good stuff, considering that most spawn once every 30-1 hr. On most occasions your been ksed already by high level (Mesos) characters, i.e bishops.
Events - we hear maple leaves are selling for 4-8k each. Just go find good spawning locations, or do the casandras box thingy, you get 500 leaves in one go, if you are lucky. Rare items (Maple Story mesos) hunting - hate us if you want, but spending hrs, grinding on drum bunnies, cube slimes, cold eyes, or zombie mushrooms, and out pops a chaos scroll - worth 50-80 mill now unless there is still millions in the market cause of the glitch. Killed the maple economy for 6 weeks.
But mind, drum bunnies drop, red whips, (1-5 mill), panlid (500k-2mill), scrolls, and lots of leaves. depending of rate of kill. Bubblings drop maple shields, and also cube slimes, - 10-30 mil still, but in a week, that will drop remarkably.