as explained by roger,
tunze is a small company, as being small it's not control by a huge board of trusties that demand a profit no matter the quality,
tunze takes pride in making a quality control product, people know this and want them, most of the parts are hand made and asemble, so
quality + huge demand = shortage
I'm very pleased with their products that I don't mind waiting for a piece that will easily last me 10+ years
sam