If you really want it, then do what I do...DIY!!!Search through the posts I've created here on NICO (there's not that many) and find the interior lighting DIY I wrote up. It's for the Altima Coupe, but the basic principles are the same. As ling as you know how to splice a wire you'll be fine!
Now I don't know how bad it is in the US, but here in Canada they're charging about $400 for the light kit. You can get the raw materials for considerably less from my most trusted source at
http://www.oznium.com. Been using them for years and their customer service is second to none.