Have a quick search on here, there was a good thread on this a few months back. It listed most of the yacht clubs and the public moorings, who runs them etc. There are definitely moorings out there if you can afford them, like $120,000 for one at Docklands or broken down into easy monthly payments of $1,300
There are definitely new deep water
moorings available on Westernport if you don't mind a 9 hour trip around to Docklands once in a while
If you're looking at hauling for winter, there's a place near Tooradin "Seahaven" where you can have it hauled on and kept out for around $30 a week plus hauling cost. It's a low budget
place and quite convenient. All he does is work on cats.