Santiago is served by the ports of Valparaiso and Valparaiso, but is not actually a cruise port. Together, the port of Valparaiso and Valparaiso serves as the point of embarkation for just one sailings every year from Celebrity to South America.
Overall Santiago is fairly expensive compared to other ports. Prices are around steady throughout the year. Check out the illustration below for the monthly average cost per day (Cruises only depart from Santiago between January and March).