Coin collecting isn't all that costly either. You can get hundreds of dollars worth of silver half dollars for free. Just ask your bank to order a few hundred dollars in half dollar roles ahead of time. Then wait for the shipment, banks dont keep hundreds of dollars in 50c pieces on hand, but they can make a request for the denomination you asked for from the mint. Once it comes in, withdraw your money in the half dollars. After that skim for the silver ones still in circulation. They should be shinier and stand out, but a way to know 100% is they were made before 1964, which is when the us mint started phasing out using actual silver in coins. There are however some half dollars made of silver after 64. Each coin is worth about 7 dollars minimum, some are a bit more because of condition.
You loose nothing (you still have whatever amount you withdrew) and you gain value. Now just spend the non silver half dollars as you normally would with cash, but don't be a jerk, do it to small purchases. If you try to hand them right back they probably will stop helping you.
Now if you go to a store to spend a 7 dollar half dollar, it's still worth 50c. However it is legal to sell US currency for more than its face value within the US so long as the coin is not destroyed, ie. melted for silver wire.
Based department calling.