Go to the markets
Boxes: Go to the markets, Pola or El Nacional, others, and ask. In most instances they will grant your request. Plus factor it's free.
Dunnage/packing material: Crumpled newspaper has always been useful. Collected from friends and neighbors makes another free item. Surplus cardboard or discarded styrofoam cut and adjusted to protect contents.
Packing tape: Go to Papeleria Higueyana, Av Hispana in Bavaro or in Veron/Beron near the bomba.
Other needed items: cutting knife, and ability to cut and adjust boxes to size -----and above all patience.
Regards,
PJT