more like 350-400 its relativly easy to install lips and sideskirts, the paint is the tough part, dont pay anyone to install the lips, do it yourself, i did mine and my buddies in under 3 hours and it was perfect!
i got my wwbigmouth kit done for 400 CAD
so just shop around at shops and you'll be able to find a good price.
but since it's lip kit just do the install your self you'll save a lot
paintand prime isn't expensive but make sure you check if it fits before paint and prime