According to a comment left a couple weeks back, the headphones are made by Bose. This model is the OE250, and the OE stands for over ear. The OE250 is going to cost $50, and there's also supposed to be an earbud model which will retail for $20
Some readers are probably going to expect me to rag on B&N for releasing expensive headphones, but to be honest this isn't the worst idea. It's certainly a better idea than a dock would have been. This might do okay (even though it's expensive). A dock would be more likely to fail.