The first half of Nine Princes in Amber was adapted into a comic in 1975, by John Onoda. Jack Kirby, a cartoonist, did some sketches based on Lord of Light , in preparation for a movie and theme park based on the book. Bibliofind , a searchable database of many stores' offerings. SciFiArchive's Zelazny selection, hard and softback. I'll list here the books by Zelazny which are available through this service.
Books listed are papaerbacks unless otherwise specified.
These selections are taken from my list of books commented on by Zelazny.