The "Austen-inspired" books are all free on Google Bookstore. There are links on
this page.
I cannot speak for the quality of any of these books.

Well, I could, but I won't, except to say that Mr. Darcy's Diary is pretty good.
ETA: Just heard from a Sourcebooks rep that Google and iBooks should be good to go. Nook Books has the free books as well. And because of the mixup, they are extending the offer for an additional day.