Someone else here recently put me onto these available at bunnings:
https://www.bunnings.com.au/brunnings-9l-coir-power-coir-peat-brick_p3023170
I was advised to be careful in regards to which to choose as some have slow releasing fertiliser, but this one apparently doesn't.
Bunnings didn't have it in stock and weren't planning on stocking it. I asked them to get it in as a 'special order'. Didn't cost me any extra - just had to wait a couple of days for it to come in - and now they stock it. I must have started something. LOL
From what I can gather, there's an American reptile brand that sells bedding which is basically the same thing.
I'm only relaying what was passed onto me a couple of months ago on this forum - I'm no expert myself. What I did find though is that these bricks go a long way and don't need much water at all! (Still drying out my first mistake of adding too much water LOL).