Write down the last 10 books your read or a list of 10 books to want to read. Look up each book at Amazon and B&N to compare prices and availability. Also check a site like
Inkmesh which lists prices from various ebook retailers. The Nook can read ebooks from retailers other than B&N as they support the epub format.
Also, check your local library to see if they have a selection of ebooks that is acceptable to your reading tastes. The Nook can read library books without having to remove any DRM.