I got some dirt from local garden supplies place. 6cubic meters of it, the truck got bogged on my lawn. Had a few mystery weeds in it, but nothing too worrying. From bunnings I normally only get their mushroom compost that I use when planting stuff out. Mostly I just compost my own stuff and add crushed charcoal as well. Lots of autumn leaves, some grass clippings veg scraps etc. I have a home made tumbler that most of the veg scraps go into, it's absolutely packed with worms.