Most of the books are free for everyone to begin with, but the thing about KDP Select is not only that it yanks the books from any non-Amazon store it might have been in to begin with, the freebies themselves will be very short-lived for a max of 5 days depending on how long the authors decided to freebie them.
After that, they all go "Prime"-only once they've expired.
Here are some f/m shapeshifter paranormal romance freebies from Moira Rogers, who IIRC is Samhain-published (might be Ellora), available free to all via Smashwords:
Kamikaze (Last Call #1),
Zola's Pride (Southern Arcana, #2.5)