American Trip Megaupload I Need To Plan A South American Trip And Need Help Finding Budget Air/bus/rail? Where Should I Look?

I need to plan a South American trip and need help finding budget air/bus/rail? Where should I look? - american trip megaupload

My friends and I have tickets to fly next summer in Rio, but need help to reach the best way to Argentina and to identify possibly in Chile. We love to fly, take the train or bus, but you do not know where to look.

Thank you!