We've published the 4th and 5th books in the Oz series -
Dorothy and the Wizard in Oz and
The Road to Oz. The books are DRM-free.
Both books contain ALL the original illustrations by John R. Neill (in color, if they were color in the first edition). The covers above link to Barnes & Noble. The books are also available at Amazon:
Dorothy and the Wizard in Oz:
Amazon US,
Amazon UK
The Road to Oz:
Amazon US,
Amazon UK