If you are in NSW, contact Mike from Carbon Demon, he'll look after you, tell him Steve from Wrapture sent you.
Hard to say how a wrap will last with track duty, as long as it's not getting sprayed with stones and the likes constantly it should be fine, most vinyl manufacturers warrant their material for 5 years in outdoor australian conditions, but the can last longer depending on how often you drive the car, if it's garaged, and how well you take care of it.
Cost is dependant upon the material used and the installer. but like i said, contact Mike and he will be able to price it for you.