Baen is going to start a new digital sf magazine. If you order now you get the magazine for a year for $30 and you can get a pack of books free. They have a bunch of bundles. I got all of the Grantville Gazzettes (five volumes) and another SF collection of stories.
I like supporting Baen, not only because they believe in giving away free books, but because they are anti-DRM. We need to support companies that have a reasonable DRM scheme (i.e. none).
Link to more info
www.baensuniverse.com