$5.99 for Xbox One DLC Blizzard Mountain expansion for Forza Horizon 3 with Xbox Live Gold.
I didn't see any really cheap deals for the Hotwheel expansion (second of two expansions for this game) but here's one digital download for $14.95 (50% off)
https://www.gamory.com.au/products/forza-horizon-3-hot-wheel… for the complete collection.
Ps. The expansion is rumoured to be based on the Snowy Mountains.
Aren't the Snowy Mountains in NSW?