Hunter's Guild President Bernard:
To be honest... I investigated a little bit after you left. With the help of the guild, I uncovered out a region that has a lot of coins.
Let me see.... From what I've heard, Lakin and Vanor Silenos in southern Aden, and Timak Orcs in northern Oren have coins.
Also, I don't know specifically which ones, but I heard coins can be discovered in the Bandit Stronghold of Oren, Cemetery of Aden, Watcher's Tomb, Earth of Slaughter, Garden of Beasts, Valley of Saints, and the Ancient Battleground regions.