This is an interesting site by AEMO. It has info and articles, however if you scroll down to Gas, then click on GSH (gas supply hubs) it will tell you the recent price movements for WGH (Wallumbilla) for wholesale gas. For those that don't know, this is where we sell our gas after transport along our own gas pipeline PPL3. Yesterday's price was $7.80 gj.
https://www.aemo.com.au/