You can grab a Boost Prepaid SIM for just $12 for your first 28 days — that's down from the usual $39. This plan gives you 80GB of data (including 50GB bonus each month for the first three recharges), unlimited calls and texts, plus international call minutes. It's for new activations only, but you can port in your existing number. The deal ends 30 November, and you need to activate by 15 February to get the bonus data. After the first recharge, ongoing costs are $39 per 28 days with 30GB data.