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 iPad, using Kindle for iPad, 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.
A Trip to the Mall for the Sissy Professor
Transexual Erotica: Volume 4 (Transexual Erotica Compilation Series)
The Naughty MILF Speeder (The Futa Cop 1)(Futa-on-Female, Domination, Cuckolding Erotica)
EROTICA: GENDER SWAP TRANSGENDER FICTION MALE TO FEMALE ROMANCE & SEX SHORT STORIES
Adult Series:THE COFFEESHOP DOMINATRIX Part I - Trust: A Story Of Sensual Female Domination (The Coffeeshop Adult Series Book 1)
From Duke to Duchess (Forced Feminization Femdom Erotica)
Soldier On (expanded edition): A forced feminization tale
Becoming Jen: An Unexpected Transformation (Gender Bender Erotica)
TRANSGENDER ROMANCE: Forbidden Business (Alpha Male Erotic Short Stories) (Gender Swap Billionaire Romance)
The Disenchanting of Princess Cerridwen: A Tale from Adalonia