Goblin Merchant Quest/Spoiler

Required Equipment

 * Rope
 * Shovel

During the quest you will get:
 * 3 Advertisement Signs
 * Perfume Gatherer
 * Guardcatcher
 * Bottle With Rat Urine
 * Casket Smasher

Method
Go to Rafzan (here) and ask if you can help. He says you can take tasks, which you need to get. There are 6 tasks available.