Price of EV3 education software
The LEGO Education website does indeed not list prices, as you have to go through a distributor and get a quote there.

However, it seems that LEGO acts as its own distributor in the United States, which is slightly confusing, especially considering it's on a separate website: http://www.legoeducation.us/. There you can get prices, and you'll see a single-user license costs 99.95$ and a site license is 399.95$ (not sure how many installations that covers, though). Of course, outside of the United States you have to find a local distributor and request a quote.