Site of an expert on the knife industry based in America that offers knife price guides
Knife price guide section of the Kovel site for antique knives, bayonets, bowie knives, military knives etc.
A section of this site has a knife price guide for the Case knife brand of pocket knives.
An online database with a knife price guide for collectible knives. Register to be able to access the database
A knife book that has knife price guides for military knives, bayonets, and other knives from the US
Amazons page for The Official Price Guide to Collector Knives, 14th edition, a knife book with knife price guides for collectible knives.