Dave,
Not many on lines around ML at all. There was one a Royal Vic some time back, but I think it's gone now. You could ask at Tooradin. They have two down there, but one is flat out doing joyrides and the other, I think, is U/S at the moment. Last time there was one at LIL doing joyrides, it was flown by the CP at Binis, Tony Rodjak. You might enquire with him as to where you could get one from.
Walrus