Every Friday I take the initiative to search through thew newly free titles on Amazon, and to identify those that might be of interest to trans* readers, fans, and lovers. Even if you don't have a Kindle, you can still download the titles through one of Amazon's free reading applications, and covert it (if need be) with Calibre. I can tell you I do most of my reading on my tablet, using Kindle for PC, and it works beautifully.
Please do be sure to check the price before downloading anything, though, as most freebies are limited time offers, and some are specific to certain regions.
Gender Swap Workout Gear (Taboo Body Swap Fantasy) (Gender Swap Gym Book 1)
Trans Pulp Smut: (Transgender, Futa, Shemale, Tranny, Trap, Tgirl, Anthology) (The Pulp Smut Anthology Collection Book 1)
Gender-Bending Medicine (Futa Fertility Treatment 1)(Futa-on-Female, First Time, Nursing, Gender Swap, Fertile Erotica)
Maid to Serve (My Futa Mistress 1)(futa-on-female, BDSM erotica)
Becoming Her Dolly
Tim Turned Into A Sexy Schoolgirl! (Gender Swap, Age Regression, Sissy Fantasy Book 1)
My Wife's Best Friend's Sissy Husband
Strip Poker and other Femdom Stories
Dark Brew: A chilling gender transformation romance