Check out this thread on the Free Library of Philadelphia (out of town or country is $15)
https://www.mobileread.com/forums/sho...catalog&page=4
post number 50 has a link to the catalog so you could check if there are books of interest
there is lots of other good info in this thread - how to get your library books on your nook for instance.
Another thing to consider is internet service or wifi compatibility. and access to a computer.
I love my nook 3G. I can download a book from B&N in the middle of the night in the woods. And they do have free public domain books as well as freebie Fridays etc.