Just found this great offer. No specific end date to the deal, so it could end any day.
This VIP Magic Pass for $99 gets you unlimited entry to Sea World, Movie World, and Wet'n'Wild until June 2016.
BUT here's the best bit…Buy 3 passes Get another FREE! eg. Family of 4, gets into 3 parks unlimited times for 14 months for $299.97.
This is a standard deal. It runs all year long. Keep in mind the expiry is always June so if you are interested now will get you the longest expiry.
Living Social had them for $80. Three successful referrals gave you the first for free, so you could effectively pick them up for $60 each. On top of that they had a mothers day special of 15% off on top of the above.
Dreamworld also have the buy 3 get 1 free as well