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.
Exposed: Cross-Dressing T-Girl Tendencies #3
The New Neighbor
FemDom Humiliation: Discipline And Degradation Romance
Lillian, Dominatrix: Say it again, or you know what will happen
Femdom Doc Gender Swap (Gender Transformation Doctor Patient Humiliation Menage Erotica) (Gender-Swap Humiliation Shorts Book 4)
Aphrodite's Curse: Book 2 - The Goddesses Take Control
Switched at his DESIRE (Part 1)
The 13th Step (The Confessions Book 2)
The Definition of Normal