For PPF it depends very much on who does it.
Some cars are available in pre-cut form and your looking at about £250 for a front bumper, leading edge of bonnet and leading edge of wings. Just for the material.
It is cheaper to take it off a reel and shape/cut on car but you need someone you trust with a blade.
To get the front of a car done professionally your looking at £500-£1000.
I was quoted £1000 supply and fitted for Pre-cut at Ferranghini in Maidstone on the front of a Golf R they had I was looking at.
http://www.ferraghinicustoms.com