The small town of Brewarrina has a small caravan park which we stayed at.  A powered site for two people cost $20 night.  Dirt sites, old clean toilets and showers, laundry, free bbq.  Quiet but for the town dogs barking around 5.30 am.  Friendly Aboriginal caretaker.  The town itself has quite a few interesting sites.   There is a well maintained free camping site beside the Barwon river.