I've just booked my flight. I emigrate to Brisbane on Tuesday on a 457 (which came through yesterday) - eeek! I've booked with BA because of their really reasonable rates for extra bags.
I'm flying -
Manchester - Heathrow (BA)
Heathrow - Singapore (BA)
Singapore - Brisbane (Qantas)
Because the first two flights are BA, my bags will be checked through and I can buy up to 10(!) extra bags at the airport
I get 1 free bag of 23 kg, 2nd bag is £40, 3rd bag + are £90 each, and heavy bags (23 -32 kg) are an extra £40.
So 3 bags @23 kg each will cost me £130 extra.