I got a reprint of a rare copy of the 1922 edition of Rudolf Steiner's Philosophy of Spiritual Activity (Philosophy of Freedom) bound with Truth and Knowledge at Kessinger Books (buy book here). It is the early Hoernle English translation before the later translators started messing with it replacing words like "mind" with "spirit" making the book more confusing.
Kessinger Publishing utilizes advanced technology to publish and preserve thousands of rare, scarce, and out-of-print books. They search worldwide for hard-to-find books and publish them in affordable editions. Located near Glacier National Park in Montana, Kessinger Publishing is dedicated toward publishing and digitally preserving important literature for future generations.
They sell 200 Steiner titles at a low cost as the copyright has expired on these books.