Telstra $69 per month for 100GB (60GB + 40GB Bonus) for 12 months. Min cost = $828. (Bonus data ends 31/8/2022.)
works out to be $35.66 if you were going to shop at JB anyway!
Link to BYO plan details: https://cdn.shopify.com/s/files/1/0024/9803/5810/files/JB-Hi…
Telstra is $10 per day for the eligible destinations with unlimited national/international calls and 500MB of data. Extra $10 for 1 GB data with 1-month validity.