I haven't had or used a hard copy BCA or AS1684 for yonks. Subscribe to standards Aust at an exxy price and use PDF's or online. They are vigilant about copyright too - and will take and have taken legal action.
IMO for most people they are not needed. Extracts are mostly available on the web (and on our Stickies) for a wide range of applications and really only a few bits are used over an over so unless you are a professional of some sort can't see why anyone would bother.
Of course I reckon that ALL standards should all be free as electronic (PDF) copies as without exception taxpayers pay for all the work done to create standards one way or another (even though businesses are involved they get a benefit form them too) and then governments mandate that we use them. I understand why they were outsourced and charges applied for hard copies, but those days have passed. Start lobbying now!
Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.