Ah my bad, didnt read under the avatar haha.
Hm, if it was black id probably give it a shot myself, just sand it all down with like ~100 then something way smoother like 300...I might be totally off on the 2 grit ammounts, but you get the picture, then go for some spray paint...
But if its like white or any other color, it would be real easy to notice if the bumper was darker or lighter, the only place really around here is Maaco or however you spell it, from theyre website, it looks like theyre pretty expensive though lol