Wishing Coins

If you see one on the ground, go pick it up!
When thrown into a well they can make from 0-700ish (my highest) dollars depending on which option you click.

Wish for:
Money- This will get you only the dough but it is a lot higher than the other options because what you get is more reliant on chance. It is random how much you get but it averages more than the mostly cheap items you get otherwise.
Things- These just give you items that you would most likely be able to buy in a store. They are mostly cheap items that wouldn't need much effort to get, though sometimes they give big fish! (A Good thing if you haven't done the Dolphins Purpose quest yet!) On some rare occasions you might get an item that would get you a lot of money if sold but don't count on it.
World Peace- It can't grant World Peace, but it can grant you money and items! You get a lot less money than if you just picked money, but you might end up with an item thats worth a couple thousand. I've only had that happen once though, so good luck!