This deal is available each year when you pay your car rego.
Always change your Qld CTP insurer and they will provide you with either a gift card or fuel card.
EG: Suncorp = $20 Gift card or Allianz = $25 Caltex fuel card
Check insurers websites as they have banners advertising the deal, which will lead you to your Motoring Authority's website, where you log in using your CRN or drivers licence number.
It is here you must change your CTP provider for the next (12 months) rego. Then when you pay your rego (by the due date like any good OB'er) this will initiate the new insurer to post out your money.
All Qld insurers charge the same for CTP - if in another state, check CTP costs firstly. No point paying $30 more for a free $20 giftcard.
Good Deal,
I got $10 off on my RACQ membership if i choose RACQ as CTP provider.