One just sold at Monterey for $412,500 USD.
That's a lot of dough, but I seem to recall at the height of the 959 popularity, some changed hands for about a million.
I heard a basically brand new one belongs to Bill Gates.
Porsche pretty much created the "supercar" with the 959. They brought everything they had, and then some. Massive horsepower, race car handling, 200mph top speed, AWD and low production made it pretty much the "dream car" of the era.