Food and Booze! Those are the 2 essentials that hurt the most!
Even though the mountain charge to get you from your car via cab to your lodgings, it's worth throwing in a case or 2 of beer and whatever else you fancy.
There's a small supermarket at the bottom of Bourke St that stocks a pretty good range of food items and other stuff.
Don't buy a consecutive day lift pass until you've checked the weather outlook. There have been numerous days this season where the entire mountain closes due to wind hold..........No lifts at all!
The Abom offers a pretty decent feed for the $$$, with pleasant surroundings.
Kooroora is also a hot spot for well......everything after dark. Cattleman's is also a rated spot to have dinner and not too pricey.
If you don't have your own gear, sometimes it pays to hire off the mountain. Usually cheaper and you don't waste time once you're there fluffing around organising it, that goes for chains as well.
The snow is at it's peak right now, so you should have an awesome time.
Cheers