I worked out a deal based on the parts being painted.
It all depends on size of the part you want painted...and the quality of the item. (do they have to do alot of prep work??)
Anyways...rough estimate for a generic bumper that is ready for paint (like the Mtech rear out of the box) would likely run $300-$350. But you need to talk to Vu to get an exact price on the piece you are looking to get painted. Lips and smaller pieces would likely be less. Fiberglass that needs to be worked on...might be slightly more based on size of the item of course.
Nevertheless...their work is top notch! Give them a ring and tell them what you are looking to get done.