I haven't seen any casino recently that takes any types of coins (Vegas as well as other locations). They all have bill acceptors that take paper money. They print a bar coded paper ticket when you want to cash out. Slot machines stopped dispensing coins when they switched over to those bill acceptors and bar coded tickets perhaps 10 yrs ago? Maybe at some tiny local casino they might not have switched over, not familiar with any of those.
Was just at a car wash place last week and they also had a bill acceptor as the method of payment.
The dollar coin never caught on with consumers since it is too similar in size to the quarter. Most people also don't want to lug around a bunch of heavy coins when making a purchase. No idea if they still mint them. Probably can look at the govt website to see the latest about that.