Cato Store
Offers a variety of books, merchandise, accessories, and subscription-based publications focusing on free markets, civil liberties, and peace.
http://www.catostore.org/

Independent Institute Publications
Online catalog of the Independent Institute publications.
http://www.independent.org/tii/pubs.html

Liberty Tree
A classical liberal bookstore offering reviews and a catalogue of books, audio tapes, videos and collectibles.
http://www.liberty-tree.org/

Reality Zone
A marketplace for documentary books, audios, and videos dealing with freedom, health, monetary issues and history.
http://www.realityzone.com/