I should have mentioned this much sooner, but there is currently a $5 ebook sale going on at B&N. The sale began after Christmas, so some of the books are no longer on sale, but many still are. They include very popular ebooks, such as books in Stieg Larsson's Millenium Trilogy, George R.R. Martin's Song of Ice and Fire series, Suzanne Collins's Hunger Games series, Lauren Kate's Fallen, and Diana Gabaldon's Outlander series.
Ebooks aren't always less than their physical counterparts, but often they are, especially new releases and books that have been out a while. These sales are a great way to save money on ebooks. Here are a few of the ebooks that are still on sale that I think are the most interesting. If you see any you want, I recommend getting them soon, as I'm sure the sale will not last much longer!