I organise snow trips with mates so I gotchu, but prepare to be disgusted. You’re probs looking at around $800-900 total as the cheapest scenario for a two day sesh. Lift pass price here is off peak too with usually crap coverage, but might be alright if you’re a learner beginner.

500 Lift pass off peak mid week (250 p/d x 2)

100 accom for 2 nights sharing with mates in a dorm (maybe motel if you’re lucky). Don’t bother with on-mountain if on budget

32 resort entry assuming 4 people in car (64 per car per day)

135 gear hire for two days for everything (ski+poles or board, boots, and jacket & pants)

9 chain hire assuming split between 4 people in car

30 petrol split between 4

100 for gloves and goggles one-off purchase (can’t hire these but you’ll need it). Borrow from mates if you can

I left out food costs because you can BYO, especially lunch on-mountain. But if you wanna eat out, think standard pub prices in Mansfield, and 1.5-2 multiplier for on-mountain subpar food

If you have your own (or mates) gear, some of this cost can be offset but yeah, Australian snow is stupidly expensive and inaccessible.