Amazon.com
Amazon. Need we say more?

The Architect Store
Virtual bookstore of architecture; also some very good links to architectural magazines and publications

Architext
Architext: Australian bookstore online

The Prairie Avenue Bookshop
The Prairie Avenue Bookshop is the largest architectural bookstore in the world, with a comprehensive inventory of books on architecture, design, technology and related fields. Our catalog - long considered the standard bibliography by professionals, students and laypeople throughout the world - is on-line and fully searchable.

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Virtual Architecture

William Stout Architectural Books
William Stout Architectural Books carries titles in art, furniture & interior design, graphic & industrial design, as well as architecture. Our database is not an inventory tracking system. It is a record of nearly 14,000 titles that have passed through the store within the past three years.