One way is to purchase one on line wherein you can go directly to the theater's website and be guided from there on. You will be guided depends upon where you should purchase, asked how many tickets you're likely to get and which sections you want. You can also easily select your seats since you will be shown the seat plan of the event you plan on attending so things should not be as hard as you believe that they are. Overall, it needs to be something that you could easily be pleased with at precisely the same moment. You can find more details on bob carr theater on the site bob carrperformingarts center.
You might also try local ticketing which you can certainly do offline. Just visit a ticket centre or the theater itself should you want to know more about this and how it will work out for you just as well. On occasion, it's just an issue of asking that will lead you into the best route possible.
No more scalpers
Finally, say no to scalpers or individuals reselling their tickets for you. Beware of those people since you could get tricked if you don't become careful and wary that they exist. If you can, try purchasing from direct sources.