For those who have expressed their will to buy Nathanaël Kuipers' Concept Car as a kit (Building Instructions and Parts included) you may have here the opportunity...
In order to promote the BI for this model, Nathanaël and Crowkillers decided to put one complete kit for auction at eBay.
Guess it won't be cheap and don't know if other copies will follow (as you know some parts are really rare by now). Take your chance!
If you just want to buy the BI for $15, this is the way to go!
One way or another, I'm sure you will find the way to have your own copy of the most wanted LEGO Technic unofficial set from the moment.