I got this in an email from Dendy.
From Friday the 8th of March through to Friday the 15th of March, we're offering $8.50 tickets (and $7.50 tickets for seniors)!
To redeem: print this voucher out and bring it with you to our Box Office, and our friendly staff will book you in for a session!
^Voucher valid from Friday 8th - Friday 15th March, 2013. When presented at the box office at Dendy Newtown, Opera Quays and Portside. Not to be used in conjunction with any other offer. Not valid for Dendy Premium, Met Opera, NT Live, Ballet, 3D sessions, festivals or special events. Voucher is single use per person and must be surrendered upon redemption. Voucher does not guarantee admission, and is not transferrable or redeemable for cash. Not valid for online or phone bookings.
Thanks for sharing