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.
Transsexual Domination 4 - Lori's New Life (Feminization Sissification)
The Boys of Alpha Theta Nu
Forbidden Discoveries with the Color Changing Dress (Taboo Crossdresser Older Man Younger Woman)
Hoopstars Volume 7 - How To Be A White Tranny Slut and Get to Sit On Black Guys' Faces: Tgirl Alhena Adams Meets The BBC With No Name (Forced Interracial Transgender Erotic Fiction)
Futanari Sorority Complete
T-Girl Love (T-Girl Adventures Book 1)
FIFTY SHADES OF GREYSKULL: The True Story of How He Became She-Man
Diary of a Tranny Slut: The Reflections of Transgender Adult Film Actress Alhena Adams (Transgender Personal Erotic Memoirs) (Tranny Slut1)
Tranny Sex Stories: Volume 1 (Transgender Erotica)
The Elfmaid's Curse (The Elfmaid Trilogy Book 1)