Cheep flights SAO PAULO to BUENOS AIRES???? Please help

Hey, please can anyone tell me some cheep airline companies that operate between Sao paulo and Buenos Aires??
I know Pluna, Tam, Gol, Aerolineas Argentias, BA, LAN. Some really budget companies I dont know but I know there is!
Million thanks!!! You dont know how much your help is worth!!!
Annika

I live in Sao Paulo, and you have the list of airlines. Depending how far in advance you look, usually Gol is the cheapest. But its possible that one of the others could be cheaper if u look at travelocity.com on a specific date.

or try an overnight sleeper bus, they are realaly comfortable

Note: Pluma is a bus company.