(found on flighthacks - https://flighthacks.com.au/caltex-starcard-10000-qantas-bonu...)
Caltex Star Card Cost
There are no minimum periods attached to the StarCard, so if you're just after the 10,000 bonus, that's not an issue.
Otherwise, the StarCar will cost you $2.95 per month which should be less than the savings the card provides if you have an average fuel consumption.
How to get the 10,000 Bonus Points
Right now, you could earn 10,000 bonus Qantas Points when you open a new StarCard account, plus the chance to WIN 1,000,000.
How it works:
Open a new StarCard account by 21 December 2018. (click here to get to the 10,000 points promo page) Link your StarCard and Qantas Business Rewards accounts by 21 December 2018. Spend a minimum of $150 on your StarCard account by 31 December 2018. Be rewarded with Qantas Points. You’ll receive 10,000 bonus Qantas Points. Plus the chance to WIN 1,000,000 more Qantas Points.