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.
Bimbo for Christmas: Gender Bender Thrills (Bimbo Gender Transformation Erotica)
Ally Turned Her Husband Into A Sexy Coed!: Book Two (A Gender Swap and Age Regression Sissy Fantasy 2)
Turned Into His Wife's Daughter (A Transformation and Gender Swap Revenge Fantasy Book 2)
The Futa's Naughty Pet
Three French Beads: Female Domination Erotic Short (12 Dommes of Christmas Book 3)
Four Swinging Whips: Female Domination Erotic Short (12 Dommes of Christmas Book 4)
Taken by the Boss
Cam Walks A Mile In Her Shoes (Gender Swap Revenge, Feminization, Humiliation Book 1)
Brody Becomes A Schoolgirl! (Gender Swap, Sissy Fantasy, Age Regression Book 1)
None of the Nuns May Dress Improperly (Forced to Work in Girls' Uniform)
LEX (An Unconventional LGBT Gay Romance Novel) (Unconventional Hearts Book 1)