The new Boost Mobile plans are fairly unimpressive ($200/85GB data - soon to be 30GB data) in comparison to the old $150/80GB plan. Thankfully, the remaining $150 SIM Starter Packs on the market can still be bought and activated up until their expiry date (March 2022). Note that once the 12 months is up, you'll have to switch to one of their new plans.
Given that the $150/80GB deal was already pretty good for using the Telstra network, this $135 offer is pretty decent. Ends up being $11.25/month for 6.66GB/month (with rollover).