I have lowered the prices on every ebook of fewer than 5,000 words to FREE at All Romance eBooks, OmniLit, Smashwords (along with its distribution channels: B&N, Kobo, Sony, Diesel, Apple, etc.), and Goodreads. Amazon, of course, doesn't allow publishers to set prices to free, although I have submitted a plea to have the titles offered at no cost.
The following titles are now FREErotica: