Okay I just did this last month. The Consulate no longer supplies, or should I say sells this document. When we went to pay for the marriage license, I found out that I still needed the paper and was pointed to a lawyers office that was next to the "Oficialia del Estado Civil" They typed up the document, had it notorized and then legalized. I do not understand why it was legalized, but it was and cost DR$3,000. I believe and it was later confirmed that we paid way too much. At the time I was not a happy camper but what ever had more things to worry about.
Also according to the consulate, a US citizen does not need to take the certificate to the Dominican AG officem and then the Foreign ministry and then to the consulate unless you plan on using the certificate in a court of law. If you plan on using it for like the INS and SSN and things like that, all you need is a legalized copy of the certificate.
Jerry