Arkhelian.com is slightly better for me on paperbacks (I can get you a signed copy too). Otherwise ebooks through Amazon. For value, the story is included in Astral Twilight vol2. As for stories before Chitterfield. It was the fifth story I wrote. There are four short stories before it (see: Astral Twilight vol1). Same universe but not directly linked. Of them, you can grab Murder Bug off the Arkhelian home page newsletter sign-up. That will give you a better understanding of corpse units.