The deal involves a bit of a hack to get Thredbo lift passes for a bit cheaper despite Thredbo absolutely extorting all its customers.
During the peak season an adult lift pass is $169 per day, and this year there is no multi day discount. A 4 day lift pass for an adult will cost a whopping $676. The hack involves purchasing an ikon session pass for USD$399 which includes total of 4 days skiing at multiple resorts worldwide of which Thredbo participates. If you use a fee free card it equates to approx $513 so a saving of around $160 is available if you purchase the pass this way.
I bought 4 x ikon passes for myself and friends last week, just submit a form online and then they issue you a ticket to collect on arrival. Fairly easy process.
Thredbo were offering buy early and save discounts of up to 15% off but this was extremely limited and has now been pretty much exhausted (best maximum discount available is 6%, but this hack still trumps it)
**Please note this pass does not allow access during school holidays and during the off season (peak season is 26/06-12/09) the saving is only about $10.