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

VOA: special.2010.03.22

The pilot spent fifty hours in a simulator -- a copy of the plane on the ground -- preparing for his ten-minute flight.

VOA: special.2010.07.07

For example, the first genetic copy of a sheep had shortened telomeres.

VOA: special.2009.12.08

Employers seeking workers usually ask for a copy of a resume.

VOA: special.2011.06.10