What we meant by repaint was, when you purchase the new front bar, rear bar, skirts, etc, they'll be a different colour to your car (most likely). The respray is just to make your car and your kit's colour the same. You don't want mis-matching coloured bumpers.
I would recommend checking out private sales first. Dealers could get a bit dodgey, but private people can as well. Up to you really. Private is usually cheaper, think of it that way.