It's not in a real easy-to-get-to place. In the links along the top of the page (Books - Nook Books - nook - Textbooks - ...) mouse-over on nook (not Nook Books, because that would actually make sense). In the pop-up window, on the right, under Nook Store, click on Special Offers. The first entry on that page is the Two-for-One Weekends.
Not exactly easy, is it? Once you get there just bookmark it.
This week they're all politics and current affairs.
This weekend's BOGO is Award Winning books. Although many of the titles are old, I was still able to find a couple not in my library that I have thought of purchasing. Sorry to post this so late since this in an in-store only offer which expires today.
I am also sorry to be responding to such an old thread, but I was unable to begin a new "discussion" in any "place" on this board.