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.
Paying my Debts (Gender Change and Body Swap)
Body-Swap: Pink and Blue 2.0
Nowhere to Hide (crossdressing, threesome)
Crossdressing for the Prison Alphas: Sissy for Sale
The Lipstick Curse (paranormal erotica)
Little Dick Tranny
Before the Billionaire Gender Swap: BDSM and the Billionaire
The Test of True Pleasure: Part 1