I went to Australia for a year 20 years ago and DH and 2 DC (teens) are keen to experience it. I've found flights to Melbourne with an internal transfer from Sydney to Cairns and then from Cairns back to London. I've priced up car hire and airbnbs in Melbourne/Sydney and Cairns and it's all come to around £8-£8,500. Is it realistic to think we could keep food (will only eat out a few times) and trips can be kept within £2k?