Not sure how much longer this will last. I just came across this Black Friday sale at Apple for free Tule books. Amazon has priced matched, but not Google Play or Kobo (at least for the few I spot checked). But I picked up the Alissa Callen at Amazon for free just now. The links on the page go to Apple, so that obviously works too (I've never bought books from Apple).
Tule blog
ETA: the titles are
- The Christmas Secret by Jeannie Watt
- A Hummingbird Christmas by Karen Foley
- Lone Star Hero by Jennie Jones
- Last Chance Christmas by Joanne Rock
- On the Edge by Dani Collins
- Away in Montana by Jane Porter
- Finding True North by Audrey Wick
- Slay Bells Ring by Nancy Robards Thompson
- Montana Cowgirl by Debra Salonen
- A Baby for Christmas by Joan Kilby
- Insider by Rebecca Crowley
- All I Want for Christmas by Jennifer Gracen
- The Farrier’s Daughter by Leigh Ann Edwards
- A Royal Christmas Gift by LuAnn McLane
- Going Down by Shelli Stevens
- His Christmas Bride by Lara Van Hulzen
- Summoned by M.A. Guglielmo
- Her Mistletoe Cowboy by Alissa Callen
- The Runaway Princess Bride by Lenora Worth
- Falling for Christmas by Kate Hewitt
- The Courage of Eli Jackson by Kelly Hunter
- Once Upon a Royal Christmas by Robin Bielman
- To Love a Texas Cowboy by Julie Benson
- His Christmas Princess by Kathleen O’Brien
- Bitter Roots by C.J. Carmichael
- Their Christmas Miracle by Lynne Marshall
FWIW, I enjoyed the Rebecca Crowley book, though I liked the next two books in her London Phoenix trilogy even more.