Maree has avgas, although the set-up is "special"...stand clear when the fuel guy starts up the pump by jump-starting it from his car, whilst smoking !
Rawnsley Park (very nice chaps) have fuel. That's where we filled up (numerous times) when flying heli's around there last December.
Rawnsley Park Station :: Watch the sky turn a brilliant red as it sets over Wilpena Pound. Be inspired by a landscape that has captivated poets and painters for generations. Marvel at Australian native wildlife and flora in its natural habitat.
You will need to call both first - and then re-call the day before.
It's a fun place to fly, enjoy.
Arrrj