most unis will have their own tae kwon do club which will be cheaper to join, and will most likely have good equiptment.
Most will have a joining fee, could be anything, and most are 5-$10 a lesson, you should be able to pay per month at some..
There are sooo many clubs in oz, some are affiliated with WTF, some with ITF, some are softer, with no contact sparing, some will let you spar with contact. This will probably be reflected by the annual fee, and how much public liability insurance they have to pay..
Best bet will be to go and watch a lot of clubs, have a chat to the instrtuctor, and make a choice...