This is one of the standout offers from Boost EOFY Sale.
However, Boost Mobile are changing their prices from 4th July so you first recharge will be $35 instead of $30 usual price. This is still a good deal given Boost has decent reviews and service.
45GB on activation for new customers. 20GB on next recharge. Activate and first recharge by 3 July. SIM includes first recharge.
https://boost.com.au/products/30-prepaid-sim