You will find the costs of building materials in Punta Cana - Bavaro higher than the rest of the country. The vendors take advantage of the assumed image the area is populated by the rich and the rich can afford the prices they ask. The vendors explain that the cost of transporting building materials and hardware from Santo Domingo warrant the prices. However, the blessing of the Coral Highway has not benefitted the area with a lowering of prices. If you are constucting a single level building, the use of used/recycled rebar may benefit your wallet. You have to shop around on the back streets of the barrios to find it. If you have your own truck you have the advantage of not paying for delivery. If you have to hire a vehicle you lose the price advantage and buying in the ferreterias offers free delivery in most cases.
The better ferreterias, Ferreteria Detallista, Ferreteria Imagin, and Ferreteria del Este/Bloques Alba in Veron will have the materials you may need.
Regards,
PJT