I think the OP is aware that he could find glass at a glass company, but his question was in the direction of where is there a glass company located? In San Pedro, a city of 200k, I have never seen, nor heard of one there. Storefronts, bars, discos and cabanas get their glass and mirrors from someone some place. Maybe the government has a monopoly on that as well.
william webster, my boots don't speak Spanish and live in artificial environment of Casa de Campo Besides - I've learned that DR businesses neglect to use Internet. That's why I asked here. This is my ground, and I ask questions - as you suggested. sanpedrogringo is right on the point.
Matilda, do you know any of those companies as good people to deal with?
La Profe_1, indeed. Edges are important.