get onto celbtante.com.au i think it is
Anyway you can search through type of ceremony, place, city etc and then contact each through email and find one you like, who will perform the kind of service you are after and essentially get a qupte oer the phone
I paid $450 for mine and that was for everything from meeting before hand, lodging of licences etc and the actual day Providing you arent getting married in timbuktu or anything odd you shouldnt pay more than $500-$600 for a celebrant
good luck!