Marketing blurb from the email I received:
"Just over 48 hours remain before our 7-day Web Sale closes at 5pm on Friday. Here's your opportunity to purchase three concerts from the 2012 season for just $49 each (C Res)* or, if you prefer, 3 concerts for $98 each (A Res)* each. Choose from over 80 concerts. Save up to 35% on the cost of single tickets. This offer will close 5pm Friday 25 November!"
If the above link doesn't work for you. Use this: http://www.sydneysymphony.com/cart/packages.aspx?pkgNo=567
The catch:
1. You need to buy tickets to three concerts right away. So the total minimum price is $147 (3 x $49) + $6 booking fee = $153.
Edit: All 2012 season concerts are available to purchase, please click on the area with little red up and down arrows to scroll through the list.
Edit: Just realised there's a $6 booking fee per transaction.
Normal prices for C Reserve vary from $55 to $75. Please choose concerts carefully to maximise bargain.