Consolidators still exist. Even airlines like BA use them. Now, I'm going to get people in the UK saying "BA guarantee the lowest price on their website". True, but last time I checked that applied in the UK. While it may now apply in some other countries too I don't believe it's worldwide. But I accept that the main users of consolidators are some of the smaller, less well known airlines.
That said go to
Flights - cheap flights, car hire, city breaks, cruises by Major Travel (v3) and look for Emirates flights London/Jo'Burg/London 4-20 Sep. When I looked a few minutes ago - £470 - Emirates site - same dates - £485.
Mark needs to look at the travel sections of the weekend editions of the New York Times, San Francisco Chronicle/Examiner, Los Angeles Times.