The Nokia Lumia 900 has become available on Movistar Argentina.
The handset is retailing for 1999 Argentinian Peso (about 436 USD) and with unlimited internet on a 199 Peso (43.50 USD) plan.
Nokia recently started Nokia Lumia 900 production in Argentina, and ended all production in Finland.
The offer can be seen at Movistar here.
Update:Personal in Argentina is also offering the Nokia Lumia 900 for the same price.
See that deal at Personal here.
Thanks Charly and Nahuel for the tip.