Salturius salebrosus are generally regarded as the biggest gecko in Australia. A few people keep them, they usually go for $300-400 each. Danny Brown had some available earlier this year, I am unsure whether he still does.
Sorry mate, I don't have a book to look it up here! Try doing a Google search, or looking on Danny's site. It's a species of leaftail from Central Queensland.
I would have said Ring-tailed Gecko too. Either that or Giant Cave Gecko, but i wouldn't really know, just going off what i've read when i was a youngster.