PPSR/REVS Vehicle Check - $3.40 @ PPSR.gov.au
The PPSR is used to find out if there's any money owing on a car, or if it's previously been written off.
This is the normal price, there's no denying that, however many people don't realise how cheap and easy the service is. Many sites offer the same thing for $10 or more, when the standard government price is considerably less!
A few horror stories in the forums lately would've been sorted very early on if they had've consulted this site before buying/putting a deposit down.
Bookmark the site, after test driving the car you're looking at, sit in your car and generate the check, then decide from there if you want to purchase the car.
If deal link doesn't work, click through the main page here