They are very costly. Or you can buy a copy of a coin for much less money.

VOA: special.2010.03.22

Your coin and battery are a very simple radio transmitter.

VOA: special.2010.12.08

And with the pushes, the coin disloged. Marquis received a medal for his quick thinking.

VOA: standard.2010.02.23

when L.J.choked on a coin. "I grabbed him and pushed his stomach."

VOA: standard.2010.02.23

"I'd have to say that equally on both sides of the coin, my successes with regards to my science are the discovery of the genetic basis of a number of different human skin diseases, using very unconventional approaches, which are now approaches in medical textbooks, but at the time, they were very unconventional."

VOA: standard.2010.03.29