A New Merchant In Town quest has you gathering some materials. This guide on Where To Find Wool, Natural Rubber, Goat Hide In NieR Replicant Ver1.22 will tell you how to track down each of the different resources you need, so you can complete the quest and get your rewards.
The quest A New Merchant is available in Seafront by speaking with the Captain of the boat on the East side of town. When you speak with him you learn that he is attempting to start a new business selling vital ingredients and materials to other towns that are short on supplies. He tasks you with finding these supplies to help stock his shop so he can be on his way and begin his new enterprise.
Where To Find Wool, Natural Rubber, Goat Hide In NieR Replicant Ver1.22
You will need 10 Wool, 5 Natural Rubber, and 10 Goat Hide. Starting with the Natural Rubber. You can buy this from the Material Shop in Seafront, it’s the one marked by the ore icon on the map. The Southern edge of town, the shop closest to the beach and nearest to the bar. Speak with the owner and then purchase 5x Natural Rubber for 700 Gold each.
Next up you need Goat Hide and Wool. Wool is easy enough to get. There are tons of Sheep in the Northern Plains. Simply kill some until you have 10 Wool. This is also a decent source of money as you can sell the Mutton to the lady in the village for 150 each.
Last up is the Goat Hide. There are goats in the Northern Plains but they do not appear to drop Goat Hide, just Goat Meat. Instead you want to head East to Eastern Road. There are a few goats here and they have around 50% chance to drop Goat Hide when killed.