i think you mean benazepril.
there is a medicine combining those two, AMLOFEL COMPUESTO. amlodipina con benazepril, by dominican lab, feltrex. it costs about 25 pesos a pill.
the cheapest amlodipina would be about 10 pesos a pill, unless you buy in promesa (government pharmacies).
in any case medicine in DR is not exactly cheap so buy in the states (short trip) or prepare to pay more (long trip). if you are moving here permanently you may consider health insurance, hipertension medicine is covered even with a basic plan.