Caravan parks that charge per site not per person

Hi All, I'm a new starter on the group (and new to 'vanning), so thought I should say hello. We've just recently purchased a Jayco Swan and a 2005 Pathfinder to tow it with. Looking forward to our first outing towards the end of August. The question that I'd be interested in hearing answers to is … Where are there (good) caravan parks with powered sites that only charge per site (as opposed to per person)? The reason for the question is that we've got 5 children, so tariffs that charge extra per child affect us particularly badly!! We're in Victoria, so are interested in sites in Victoria and then up the east coast to start with. Look forward to your insights. Regards, Derek.