My partner and I are hoping to spend a few days at Mt Buffalo around the Christmas/New Year period. The Lake Catani campsite is already completely booked out for the school holidays, but I was hoping that maybe due to the weird booking system that forces you to book a site for six people for a week minimum, somebody might have some spare space in their site that they wouldn't mind sharing. Tentative dates would be 28/12/13 to 3/1/14. We'd be happy to contribute to the camping fees of course.
All of the peak period booked out before 10:15am on the 1st of September; it was pretty insane this year. If you want sites, you really need to be there and waiting for the system to open at 10am September 1st each year. It's a bit insane, just like the booking system itself (incidentally, each site is for 4 people, if you want 6 you have to pay even more!)
I have sites the week leading up to Australia Day Long Weekend if you can shift your trip later.