How much would an iPhone 5 cost at Telstra?

Well I've figured out the plan prices but I would like to know how much it's gonna cost to buy the iPhone.

If you're getting it on a monthly plan you usually pay $10 or less for the phone because you bought it on a plan so you're already paying for it monthly and you get locked to a contract for 2 years usually if I'm correct.
If you were buying the phone on a pre-paid plan, then you'd have to pay full price but I assume you're getting it on a monthly plan.
So don't worry, you'll barely be paying anything for the actual phone.