You need to go to the Government's office called the "Oficilia (de Registro??)that is located NEAREST to the place in the DR (either the church, or the judge's office, etc ) where you got married, and they will issue as many copies as you want.
They used to cost about RD$20 a page.
If you don't know where the Oficialia office is, the priest or the judge's office will know where it is, and how to get there.
Suerte.