From The American Malacological Society

Architeuthoceras said:
The Mollusks, A Guide to Their Study, Collection, and Preservation

with chapters on cephalopoda and fossil mollusks

Why cant fossil books be as economically priced?

It's all about supply and demand...When I managed a bookstore the crappiest books would sell lots and lots of copies at $4.99 or mass market papaerback. Of course the paper would turn yellow, the bindings would break and the pages would fall out. Trade paperback would be significantly more expensive, but they were much better quality, and usually books that weren't aimed at the lowest common denominator. Some of the mass market books had decent authors too, of course.