You can get almost everything of his via CC license at his website in the Backlist section. I keep all his novels on my Nokia 770 for quick reference; even the man’s endnotes are worthwhile…I have 2 books in my reading queue b/c of them.
Oh, yeah…my non-total fanboy point to this rant. I was poking about in his backlist section, and decided to read some of the Commentary stuff. The Hierarchy of Contempt is a must read for any fan of contemporary science fiction, and a telling quick analysis of the state of the genre today. It’s just a few pages…go knock it out!