First off, you are then looking to buy either 1000 meters or 2 tareas. (1 acre is approx. 4000 sq meters and one tarea is about 630 square meters.)
Then, it depends on the location. I have been told that you could buy the corner of Ave Lincoln and 27 de Febrero (presently a "car lot") in Santo Domingo for about RD$80,000 per meter. Too high?
Then you could go to Gazcue in Santo Domingo and buy a teardown house on about 1000 meters for about RD$8000 to $10,000 a meter. Too high?
Then you could go to the east side of Santo Domingo near Ave San Isidro, or the north side of Santo Domingo near Villa Mella ,and probably pick up 1000 meters of raw land for about RD$2000 to RD$5000 a meter, but no chance in the foreseeable future of reliable electricity and no water from the city. Also, you would need a watchieman on the payroll for protection in either area.
Too high? Go out in the country, find a dominicano with a big piece of land, and tell him you want to buy a small piece of his. Wave about US$8,000 to $10,000 in cash in his face, and then carve out about 2 or 3 tareas, and then spend another year getting the title changed so it covers just your land. Also plan on supplying your own electricity, own water, and having to use a cell phone. And, if you will be gone for any length of time, building a small watchieman house, and hiring someone to live there and protect your investment.
Good luck.