I used to have at least one Leiber book floating around, and possibly even a Michael Moorcock, but I never read them, not having the earlier stuff, and I haven't run across them in a while. I see Swords against Foo in used bookstores not infrequently, but the area libraries don't seem to have much except for some of his short stories in anthologies.. (Baltimore County has several of the Swords against Foo, but only in Russian) ... Knight and Knave of Swords, the most recent one (and I think the one I had,) published in 1988, is out of print but fairly widely available in libraries.

It appears at least the first four are being reprinted, but I don't really see any sign of that on amazon.com, though some libraries seem to have them or have ordered them..