Questions regarding 50 cent pieces.

Some banks have half dollars in stock, it's a hit and miss game with them, however, all banks will readily accept them for change or deposit into your savings account.
As far as spending half dollars at private businesses, good luck! They not only have the right to reject 'em, but most clerks have never seen one or even knew of their existence. When I tried spending a roll I had a few years ago, I had experiences from cashier's calling their manager out to the front cash to dialing 9-1-1 believing I was trying to pass funny money. I just grabbed my halves and ran like Hell.

Glenn

Thanks for the replies, everybody. Pretty much confirms what I thought. I guess a good relationship with your local tellers is the key! :-)