This one is not quite for sale, but it once was. It was auctioned in 2009 with an estimate of between $30,000 and $40,000. It was the work of R. Buckminster Fuller and it was one of many that were sold at the time.

90-Strut Tensegrity Geodesic Dome

Add in here … descriptions and links to all the categories under about the different approaches and so on.