+ Amazon.com
Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & personal care, gourmet food & just about anything else.

+ Barnes & Noble
Barnes & Noble.com is the Web's premier destination for Books, DVD, Music, PC & Video Games, Children's titles, Toys & Games, Gift Cards, and more

+ Development Bookshop Online
ITDG Publishing

+ DirectTextbook.com

+ Earthscan

+ Fatbrain.com

+ ISBN
Comparative pricing for any in-print and many out-of-print books

+ ISEAS

+ Johns Hopkins University Press

+ The Price Search
Book prices from multiple vendors

+ National Academy Press
2,000+ reports from the National Academies available free online

+ NHBS.com
The Natural History, Environment and Science Bookstore

+ RFF Press

+ World Bank InfoShop