Try lastminute any time now.
Some good value, nice for family on snow at Perisher :-
Eiger, Barrakee, Peer Gynt, Corrobaree.(park at ski tube B/flat with free Oversnow).Barrakee and Peer Gynt are remote from Perisher centre so very quiet, but true ski in/out, near North P and Intercepter lifts. (My 8 year old loves this area).
smigs :- The Lodge, Snowy Gums, Smiggins Hotel.(You can park at smigs all week if driving, but may have to book earlier as places can be limited)
Having been to both many times, Threadbo village is great for party and single people. Perisher is more family orientated in my experience. Try and find ski in/out or many places near lifts at Thredbo.