Originally Posted by M60_to_LGA

If you land at EZE, there's a machine in the entrance area between the McDonald's and the kiosco that might be able to sell you a SUBE card (I know it does top-ups). The kiosco itself might also sell them. You can also buy them from ticket booths or machines at the Subte stations downtown. If for whatever reason they're sold out, they should at least be able to tell you where to find one.