Yesterday Etihad and others were for below $2400.I have had a quick look at the Qantas website, which shows fares of around $2800 to $2900 at that time (and a fair bit more before Christmas). As noted above, if you want to fly Qantas it is best to book through the Qantas website. As Markis10 points out, there are a lot of cheaper airlines than Qantas. Check the various sites, note the prices, then have a look at the airline sites.
When I needed to use an agent, I used to use Qantas Travel until they shut down. Then I went to Flight Center (better then some of the other travel agent options in North Canberra). It really depends on which agent you deal with. I've had some shocking agents and some really good ones.
The current agent I deal with is so popular that she only takes appointments.
Some of the others I've dealt with wouldn't know 1100 from 2300.
When I went to the nearest Flight Center branch last year to book a DAS13 and extra short flights for the connecting DONE3, she was quite surprised and impressed that I had everything (flights, availability, required fare classes, etc) all ready and she just had to enter them into their system and get the price.
There have been times when I've found better flights for my parents holidays then their agent has. A few years ago, before they found their current agent, they were on a RTW trip and were traveling DUB-JFK. Their agent wanted to send them back via AMS. Mum doesn't like flying and refuses to spend more then 8 hours in a plane at a time such that their trip last year to southern Europe routed CBR-MEL-KUL-DXB-FCO out and DXB-BKK-SYD on the way back with stops in DXB and south east Asia (until they started booking Business...), so you can imange her response to the agent when I looked up the airlines and available flights for their RTW and told them there was a non stop direct DUB-JFK flight valid for their RTW ticket.
Oh and here on AFF we have a saying, friends don't let friends use FC.
I generally book directly with Qantas.
Occasionally I have used Expedia if they have been cheaper or I wanted a specific routing I could not get on Qantas.
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Hi Fiona, as you want to travel with QANTAS you will pay more than with other airlines. I had an agent who managed to get much better rates than those on line, but unfortunately she is no longer working in the industry. There are a couple of sites which do give you pretty good rates one of these is Alpha Flight Guru - I can't remember the other one but try this and see how you go.