It looks like quite a few libraries have some of the Star Wars books available in ePub format for download. Of course they'll expire in 14 to 21 days, but if you have a library you have access to has them available for download, you can check them out there.
To see which libraries in your area might have them available, just go to:
http://search.overdrive.com/classic
Type Star Wars into the title and choose ePub as the media type. Looks like a few of the libraries do have some available as PDFs--while these won't format on your reader as nicely as the ePubs, they are available and free to read.
dordale
