Front Bumper Stone-Chip Damage

The silver paint finish on mine is taking a terrible pounding from stone chips. The paint seems to be incredible weak. Even the shortest motorway trip leaves the car with another fresh crop of chips. Up to now, I've taken the easy way out & covered them using a touch-up stick from my stealer, but it's getting to the stage where it looks like the car's got a bad case of acne. /ubbthreads/images/graemlins/frown.gif

How much should a decent independent body shop charge to respray a front bumper? /ubbthreads/images/graemlins/confused.gif