It’s easy to share metered taxis (AR$100) between the city center, the bus terminal and the airport. From Av Kirchner, buses marked ‘B’ or ‘Terminal’ link the city center and the bus terminal (AR$14).
Car rental is expensive due to the poor conditions of the roads to most places of interest. Despite exchange rates, rental deals are often better in Punta Arenas, Chile. For local rentals, try Riestra Rent A Car.