I was backing out and on the turn I bumped my front bumper and scraped the rear side of a white lexus rx330 (05 model)... some scrapes and some color came off, no dents... its about 12x5... I was willing to pay off for the damages and I was wondering how much would it usually cost to fix it at the dealer?

If they want to paint the whole bumper it will probably cost about $300-400.

If they want to paint the whole bumper it will probably cost about $300-400.

depending on the quality and paint color, $150-400

you need to get estimates from body shops. you are going to end up paying for wherever the owner wants to take the vehicle, as they legally can.