Canarsie-- I just returned from Argentina. I did do some flying but my ticket was bought by a local TA. he's very good and I am sure he can get you a nice deal on the BUE-Iguazu portion. Buses are really great but time would be a factor. If you are intersted in contacting the TA-- send me a PM and I'll give you the info. When I tried booking from here I got some outrageous prices-- my 4D3N package ( including flights) he booked cost me less than the flight to Ushuaia!!