Raw land in and around Jarabacoa starts around $10 per square metre and the closer to town you get the higher the price $40 US is about average for reasonable accessable land. Check out the two sites from Constanza for what is offered there. Personally I would do a search Se Vende and whaterever area you are interested in.
Constanza.com.do
Inmobiliaria Paraiso En Venta