Phft. Other ebook experiences show that publishers will just insist that ebook prices would be around (or probably more) than the same price as the paper textbooks. Publishers know they have a captured market, so to avoid cannibalization (and fears of loosing the grip on their market) they're not going allow those prices to go down. Even a big retailer like amazon isn't going to make much of a difference, since a larger majority of textbook sales are not from amazon.

It's going to be a slow road.