I wonder how good the Frommer's and Lonely Planet guides are on Nook...
They're hedging their entire company on a product which their main competitor is going to start giving away. They'll need to make a lot from the sale of the books to make up for that.
http://www.infendo.com/nintendo-3ds-wont-be-sold-at-a-loss-s...
The tradeoff they made was using significantly cheaper, lower-performance hardware, skipping HD and leaning on the uniqueness of the motion control tech to move units. It proved to be brilliant, and while Sony and Microsoft's console business struggled for years, Nintendo's been raking in the profits.
Unfortunately, the Nooks have tried to compete on hardware features and don't have any disruptive technology equivalent to the motion controls. The Kindle is the simplest, cheapest ebook reader out there, so if their competitors want to do a loss-leader strategy, they'll need a bigger subsidy than Amazon.
This is a razor/razorblade situation in a rapidly emerging market. If B&N is letting AMZN undercut them by even $1 more than necessary on the purchase decision that _defines_ which company a customer will buy their books from (and probably their next reader as well), they're idiots.