Here is the link when it was FS on Pelican. i don't have the old e-bay listing. the guy who actually sold it in alabama to the guy in cal is obviously a broker also, but around the same time he had also sold a 78 and 79 930. one belonged originally to bill gates.
http://forums.pelicanparts.com/porsche-cars-sale/477921-80-930-turbo-sale.html
for another data point, someone in Oklahoma recently sold an 80 930 that looked real sweet/imaculate. i think he sold it for low/mid 30s. i understand that one went back across the pond.