Just call the hotel you are staying with...
I have to disagree with kingofbanff. On the recommendation above, I contacted Richard and got a quote. While he was friendly, prompt, and American, his estimate was VERY high. So, I then contacted the hotel I was staying with and arranged something with them. In the end, I paid less for everything I wanted (and then some) at the hotel than Richard's proposed coordination fee alone. Look, Richard is no dummy - if you aren't willing to negotiate with Dominicans, he's gonna make it cost you. But, then again, if you are afraid of Dominicans, why are you getting married in the Dominican? :cheeky:
So, in short, I would strongly encourage you to just contact wherever it is that you are staying and see what they can put together for you. My guess: it will come out easier, cheaper, and probably better as they have all the local connections.