Buy a car without physically seeing it
I have used a third party called Lemon Squad-
Pre-Purchase Car Inspection | Vehicle Inspection to go and inspect the car I was thinking about buying. They did a great inspection with tons of pics and they also were able to use a device to inspect how much body filler or how thick the paint was. Best $275 I ever spent. Did not purchase the car after the inspection. Saved me lots of money...