In chapter 5 on Keelhaul Key, walk to the northwest of the camp. Talk to the mole and hit him with your hammer he will leave behind a bump, get the bump. You can leave the area and go back there again to repeat this. Or, after you finish the pirate’s grotto you can enter the grotto through the hole in the mountain and exit, then whack the mole again and again. This way is a lot faster. You can sell them in different places for different profit.

• The shop in the Rougeport plaza - 55 coins.
• The shop next to Pianta Parlor - 64 coins
• Excess Express - 100 coins
• Every other shop will only give you 50 coins.