Fishing
Facing any body of water/fishingpool, with a simple fishing pole, you are able to catch fish. There are different types of fish and different types. The rarer the fish the higher the gold value would be. Fish could go from common-super rare, and sell any where from 3gold common, 5golduncommon, 10 gold rare, 100gold super rare. Or you could just skip having to sell the fish, the reason I wanted to use fish is because I was thinking you could also eat them. The higher the fish the higher it can heal for when eaten.
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abforme2005 commented
Edit* Meant to say different colored fish. I don't expect them to be animated or wander the water at all(no NPCs). Just simply fish as items that can be caught and sold using the fishing pole. Fishing Poles could be exempt from being sold. /nukefishingpole could be a new command to delete fishing pole from the inventory as needed. Fishing pole could cost 600gold and require level 6 to buy to keep new people from getting fishing pole to early. To conclude my idea fishing poles can be traded.