If you book in for an appointment with the nurse, you will only pay for the cost of the flu shot, which is $20. You will also be seen briefly by a GP beforehand (n.b., no other GP services are available for this appointment, including scripts and referrals).
If you book in with the doctor (outside of nursing hours), you must pay the standard appointment fee and, if ineligible for the free vaccine, the cost of the flu shot ($20).