I was checking up on my Shipster subscription and noticed on the main page "Pay nothing for 1 month then as little as $10 a year".
Following the 1 month trial offer, you will be automatically charged $1 per month or $10 per annum (as selected) until you cancel your Shipster subscription. All payments will be deducted from your PayPal account. The monthly or annual fee (as applicable) is deducted from your PayPal account. 1 month free subscription of Shipster and reduced subscription fees are not available concurrently with any existing offer for free or reduced subscription to Shipster. Offer available to PayPal customers only. By agreeing to the offer, you also agree to the Shipster terms and conditions which can be viewed at auspost.com.au/Shipster
This would be good for those who didn't already get the free 12 month Shipster subscription through Cotton On.