You can order a birth certificate with a credit or debit card through Puerto Rico's official government website or VitalChek.
Vital Chek
Each copy costs $13.40. If you want it delivered by express mail, the cost is $18.
PR.gov
The first copy is $5. Additional copies will cost $10 each.
If you live in Puerto Rico and are a veteran or 60 years old or older, you can apply for one free copy. Additional copies will cost $10 each.