I'd like to know how I go about purchasing AAMI Stadium Category 1
tickets for the AFL premiership season.
I believe these allow one access to every home and away game
throughout the year, and that there may be a waiting list. Other
websites have not been able to give me an indication whether they are
available to anyone or a price. If you could provide me with more
information I would be very grateful.

Have you checked out the sponsored links under your questions? I had a
quick look at www.astsports.com.au Phone 1800 026 668 for enquiries.
If they can't help you with what you want they may know who can.