LAN has South America Airpass and it makes it affordable, but you need to fly them to South America and out of South America again...

Not possible for me, is there any good travel agency with great flight deals for South America?

I'm starting in Peru, then Galapagos, then Santiago, then Buenos Aires and finish in Rio de Janeiro.

Any suggestions what to do? buying one way tickets on these routes is horrible expensive.

Many thanks in advance.