How do you get mordens coin?

It's not quite clear what you mean. ALL coins are made in mints, by definition. If you mean a MINT STATE coin, it's a coin that's exactly as it was when it was struck, without being in circulation....

I believe that you are referring to Yap, an island in the Pacific which historically used large stone discs with a hole in the center (like a millstone used to grind grain) as money. These "coins"...

You could have 5 quarters or 10 dimes and one quarter or several other combinations of coins.

They re-sell them (they only pay you a fraction of the value.)

With the exception of a few very noticeable errors such as broadstruck coins, 99.9999% of bent coins are the result of damage. That makes them worth only their face value or metal value, whichever is...