The discounted price is currently only available on the sim card pack bought via the Boost online shop, as a new customer. https://boost.com.au/shop/150-prepaid/
They will post the preloaded sim card to you.
The discounted price cannot be applied as a normal recharge for existing customers.
Occasionally there are deals for "recharge vouchers" through retailers like Coles etc. There was one before Xmas, but I am not aware of any recharge promos happening right now.
* I am a Boost Australia customer. This is a peer to peer community where users help each other.
