The suggested retail price through QBP is $150 which is a lot higher than the Japanese price of about 10,000 yen or about $100. The Japanese list the old 3N70 at around 8,500 yen, so I would have expected the newer hub to be priced just 20% more - not 50% more!
As an aside, when I browse, say, Cycle Yoshida, there's a lot more selection of cheaper Shimano hubs and plenty of wheelbuilds as well. Too bad there's no overseas shipping. But as I'm going over there in a month, I'll pick up a few to build into wheels in January.