Free $2 Prepaid SIM
Seems to be back without an expiry date this time, was unable to find it in the Optus online shop but from an old link seems to still be there and on sale as an Online exclusive.
Optus $2 SIM free, and free delivery.
Order online. No credit card needed.
Perfect for your port in and port out needs, I had used one recently for a Boost Mobile port in port out.
Note regarding the $10 Minimum Recharge your are able activate the SIM and port in your number for free via there live chat function with no recharge required, i have previously done this and it was very simple and allowed me to port in and out for a Boost Mobile new customer promo.