KidFriendly is a website that offers discount coupons to various kids-related activities — mainly holiday attractions in Sydney, Melbourne and surrounds, such as zoos, aquariums, theme parks, as well as play centres, etc. Check out the coupons PDF for the exact discounts. There are printable coupons for Taronga Zoo, Sydney Aquariums, the Australian Reptile Park, OceanWorld Manly, to name just a few.
They publish their discount coupons quarterly, so most of the current ones (for Summer) will expire in April.
I think these would come in handy as we're going into holiday mode…