Where do you trade in maple leafs in Maplestory?

Since Jubilation (Maplestory's 6th aniversary) is going on right now. Every monster drops Maple Leaves. If you talk to Cassandra (she's in every major town) she could transform 500 leaves to 1 maple coin. If you have enough coins, you can talk to a NPC to trade your coins for maple weapons. But I would highly not recommed it because some monsters drop weapons.