I don't remember exactly how much it cost but it is one of those thing that I regret I didn't get it done through the builder.
I believe it is cheaper or about the same price through the IP then 3rd party electrician. It is not that hard to setup after closing by an experience electrician but it might requires open couple holes through the drywall.
Like all the electrical stuff, I would recommend get it done through the builder (Irvine Pacific).