It's $300 at Lotus Garage - That's about what I paid 4+ years ago at another dealer. Here's a link: Lotus Garage -
The kit is fairly easy to install, and it comes complete, so no trying to piece together a set up. Keep in mind that the driving lights are high intensity DRIVING lights - auxiliary high beams - and not "fog lights" as found on most cars. They come on with the high beams, and really light up the road.