The common coins that circulate are pennies, nickels, dimes, and
quarter dollars.
I have not seen a Kennedy Half Dollar or any dollar coins in
circulation in many years.
The government still mints the Kennedy half dollar in the
millions, and even if you ask your local bank, they do not
have any.
I remember back in the days of 90% silver coins that were
circulating, if you spent a $5.00 bill, and get half of it back
in change, it would most likely included a half dollar.
Those were also the days that you could take a dollar bill
to any bank and exchange it for a Morgan or a Peace 90%
Silver Dollar.