I've just had another letter asking whether I can sell someone a copy of the later Syndicate books. The answer is that I can't sell (or give away) the Loose Id editions, because I don't hold the copyright in that specific edition. I would need to produce my own edition first, which would take a certain amount of work.
What I was vaguely thinking of doing was serialising the whole thing on my website next year, perhaps one chapter a month. Not promoting it, but just making it available to anyone who was looking for it. But I've had several requests specifically for Vol 3 and Four Leaf Clover, from people who'd bought the first two books but not got to the others before they went off sale. So I think I'm going to put up Four Leaf Clover first, as that's a single novelette and should be relatively easy to format. I probably won't have time to do anything about it for a couple of weeks, but at some point I will be asking for people to test the download to see if it works.