They have a fairly large cataloug of Science Fiction/Fantasy books available at:
http://www.baen.com/library/
They are tricky about it though - they are tease you by only offering the first book in a series1 It's the whole book, but just like any good pusher, the first one's free to get you hooked!
I guess it's good that you can read the first one to see if you want the rest of the seires though.