I originally planned to make the ebook of Twin-Bred free, on as many sites as possible, once its sequel, Reach: a Twin-Bred novel, came out. Reach isn't officially "released," although it's actually available on Smashwords already (so Smashwords has time to distribute it to various other booksellers by the release date of May 23rd). However, as I mentioned yesterday, I've reluctantly decided (if I don't change my mind) to put Twin-Bred in the KDP Select program for at least one term, as a way to promote Reach.
So to make it up to you folks -- especially those who can only read .epub or PDF ebooks -- I've made Twin-Bred free on Smashwords for the few days before it disappears into the black hole of KDP Select. Whether Smashwords will manage to change the price on B&N, Kobobooks and/or iBookstore before I have to pull it, I don't know.
Here's the link: https://www.smashwords.com/books/view/94490