GMA... Rocky's right.
Unless there is a holiday weekend in November (don't think so??

) you should be able to find a room with no problem. When you get here, just book your first hotel choice for one night or two, this will give you time to perhaps find something more to your liking for the rest of your stay.
If you want to give a list of preferences for the type of lodging and price range - I'd be happy to give you some ideas in the Cabarete area. I'm sure others can and will contribute with info on Cabarete, Sosua, and other areas that fit your requirements.