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.
Your True Self: An Informative Guide For Transitioning Transgender Women
From Bro to Brat: Gender Swap on the Camping Trip
Mistress Lara: a femdom story of submission and sacrifice (Femdom stories Book 1)
Edge Play X
The Gnoll's New Lover
Normal? (Sam Ballantine Book 1)
The House of Pain and Pleasure
Meghan Chavalier Triple Play