Originally Posted by THE TECH
^This. If the bumper is the only item being replaced and painted, no shop is going to blend panels unless you are paying extra for it out of pocket. Blending panels only occurs when you are doing hood to fender or fender to door or door to door or quarter panel to trunk lid.
+1 .. Any decent shop should be able to match the bumper to the hood and fenders without a blend. Like Tech said, when you start going into areas where you can see more than one panels or if it is a large section (hood, fender, doors, basically anything more than a bumper) then it needs to be blended.