It seems like FEE took down the HTML version of the book that was on their site. The free PDF/DOC is located here now:
The PDF (and thus my EPUB) seems to be a scan of the 1952 "Pocket Book Edition" created for FEE.
NOTE: Random House hunts down all copies of Economics In One Lesson EPUBs (even hunted down that HTML backup I made of FEE's old version), through a middleman company called Attributor, Inc.
I would recommend reading the free PDF version on FEE's site, even though the scan is full of artifacts (I bet Random House would take down a version of the PDF that I cleaned as well). The .doc version is riddled with errors and I would avoid it at all costs.
If you want to read the book in HTML, a kind Anonymous user left a link to a very nice HTML version, but it is quite locked down.
If you want a physical copy of the book, I would recommend going to Mises.org and purchasing the physical version.
If you want to read it in EPUB, I would recommend downloading versions out there from your favorite P2P program, although all of the ones I have found are nothing compared to my quality.
Sad to see one of the most influential books of all time get locked down so badly by copyright.