The whole kit; Connectors, Projectors, Ballasts, bulbs etc including shipping was just under 260 Euro (based in Germany atm), this included some uprated bulbs. Got them from : https://www.retrofitlab.com/
If you email them they will send you out a link specific kit for the 159.
The kit I ordered was with the D2S connectors these are what most OEM hid bulbs are fitted with; this means that it is easy to get new bulbs from halfords etc if you need one that night. Unfortunately you need to either remove or hack away at the headlight covers so that the connector fits I will post a picture up tonight If I can.
If I was going to do it again I would get the amp connector version and just carry a Amp to d2S converter in case I needed a replacement in a rush, Or just carry a spare set of bulbs. If you did it this way you would not need to hack away at the covers and just drill 1 or 2 holes in the base of the headlight assembly to thread the connector through, this could then be sealed up. Then you can attach the ballast on the bottom of the headlight and it would look very neat!
I did it this way but with the D2s Connectors and it still looks pretty good.
Remember to do this you MUST remove the front bumper (Its a pain) make sure you have some good quality torx sockets as the bolts are will probably be rusted solid. A Good tip I found was to put the Torx socket in the head then hit it with a copper hammer a few times this generally did the trick to 1 remove any rust from the torx head and 2 broke the contact of the thread so that it could be removed without damaging the torx screw. Also drenching them in some penetrating fluid the day before is a good Idea as these torx screws need all the help they can get.
Let me know if you have any questions
When working inside the headlight I would also get some torx keys with a ball head to allow you to get in their from an angle It can bea bit tight when fitting in the new projector.. like these : TORX-Winkelschraubendrehersatz 9 pcs. 967 PKL/9: Amazon.de: Baumarkt
Here is a video of what you need todo inside the headlight to change the projector: https://www.youtube.com/watch?v=pgZBtLWRR_s