Most expensive golf club

I have heard of a putter called the "Grunmeister" which means Master-of-the-Green in German. Some people call it the "Royal G" in reference to it's crowned shield G logo, or the "four-fifty-five G" in reference to the weight of the club-head. I guess it is machined out of a solid-block aluminum alloy that is incredibly high-grade, high-cost, and is not available anywhere in the US. Although, the club is actually manufactured in the US by a company in Milwaukee, WI. Supposedly what they have achieved is the ideal head-to-ball weight ratio with this superior material. People that have seen this putter or have used it say that it is quite possibly the most consistent Golf putter ever made. As far as the price, one has not been set, maybe this is why it could become incredibly expensive to acquire one of these things. Its also remains in the prototyping stages, so finding one may be impossible.