Velero Beach Resort in Cabarete actually does have some super deals for September, because they are renovating their pool, making it a totally ceramic tile bottom with about 200 fibre optic lights embedded that will be ... nice. Prices for September are 25% - 30% off or more. Just look at Trip Advisor and compare. #1 for 3 years running, and for a good reason.
If you're looking for cheepy cheepy, look at Ali's Surf Camp or Kite Beach or Kaoba or La Alegria or San Souci and a myriad of others. Go to FB and see "Cabarete restaurants, etc." or other sites. You want quality? Compare to fit your budget.
Velero or a couple of others for quality experience....otherwise, you're bottom fishing, which are suitable for budget travelers.