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It varies shop to shop person to person,
I had a fellow press out old install new bushing for 50.00 but I have heard people paying a lot more.
Powder coating the same, i would shop around and would think under 200.00 because last one I called said he would do my wheels for 200,
I would think wheels harder to do.
In the Dallas area $150-200 for powdercoating. You need to drill out the holes for the new ball joints before you have them coated. Prices vary on removal and install. The hard part is finding someone who can do it without messing up the new finish. I have special tools for installing bushings.
You will also need to paint your ball joints, bolts, bushing cases, and bushing washers.
Mike