Shropshirerosie, did you know that the Sony ereader is compatible with the library system. Join the library, they give you a membership number. Go into the website and pick out your books. They aren't always available altho they do tell you how many are ahead of you. I'd pick out three for the hold list and that worked out fairly well. Just like regular library lending, you have to read it in two weeks or it disappears from your reader. I got one as the nearest library is over 30km.
My Kindle works in my library system the same way. I just finished Catherine the Great. What was nice, I had my wireless off, so had it for a little more than the borrowing period because it's a long book and I didn't manage to finish it in time. Once I did finish it and turned my wireless on, poof, it was returned. So far I don't think I've got a late fee to pay.
I also have Amazon Prime and in addition to free shipping and other perks, I can borrow a book a month from their lending library.