Contact your local dealers. They have mobile painters that visit them almost 1 once a week. They perform on the spot paint. Mainly front bumpers and touch ups to bring back the used cars to a presentable state.
Dealers use these guys constantly and more than likely if others have bought used cars on lots before they probably have been "touched" by these portable painters.
Some of them will even visit your place of business and paint your bumper while you work. Prices varies but I've asked about 1 year ago and he said 120USD. Not bad considering that the bumper will probably end up chip'd again through regular use.