Tiph Our library also uses Overdrive.com and has all 5 books in this series available to borrow. Also - though not free - I noticed this evening that Amazon has the Kindle versions for just $1.99/a book -- totally worth it, imo!
Anne I found 4 so far at my library. It also has ILL(Inter Library Loan) where I can get books from other libraries for free, Hoping to get the others that way. Love the series.
Abigail Does your local library system have a digital section or website? Overdrive.com is used by a lot of libraries, though I think there are other similar sites/services, too. If you go to Overdrive, you can enter your zipcode and find out which, if any, of your local libraries use it. If they do, and you have a library card, then voila. Since this book is new, it may not be offered by your library yet, but you can request that they buy it.