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.
Staying Her: A Transgender Romance
Chained Melodies: Courage isn't about facing death, it's about facing life - and life isn't always conventional: a contemporary adult romance novel
Cynosure Illustrated Fiction
Once upon a Sissy Time
Collected Fiction: Preview 1
Halloween Gender Swaps: Ghoulish Gender-Bending Box-Set