These EPUBs should be up on Mises soon (grab from my site if you don’t want to wait):
The Economics of Liberty by Lew Rockwell
The Economics of Inflation by Constantino Brusciani-Turroni
Individualism and Economic Order by F.A. Hayek
Economic Policy: Thoughts for Today and Tomorrow by Ludwig von Mises
This one is not on Mises, but it was printed by Liberty Fund (a commenter on my site requested it):
Envy: A Theory of Social Behaviour by Helmut Schoeck
I updated my EPUB slightly of this book:
The Socialist Empire: The Incas of Peru by Louis Baudin
because of this topic: https://forum.freecapitalists.org/t/incan-socialism-some-initial-thoughts/26268