Not too very long ago, I posted a request for comments about school book fair companies on my favorite school media listserv, LM_Net (which, if you're not familiar with it and are in school media/library work, is a GREAT resource). I'm sharing the list of links on the various school book fair companies, as well as a link to a great article about school book fairs. If you're interested in LM_Net, you can check out information about them at http://www.eduref.org/lm_net/
If you are wondering about whether or not to even DO a bookfair, check out: http://www.writing-world.com/children/bookfair.shtml
Scholastic: http://www.scholastic.com/bookfairs/ to formulate "wish lists."
Bedford Falls: http://www.bedfordfallsusa.com/
Turtle Express: http://www.turtleexpressbooks.com
Local Bookstore Bookfairs: Contact local bookstores, such as Barnes and Noble and Borders--sometimes they will work with schools to arrange an in-store book fair for the school.
Personalized Book Fairs: http://www.personalizedbookfairs.com/
Just Us: http://www.justusbooks.com/SchoolBookFair.html
Mrs. Nelson's Book Fair Company: http://www.mrsnelsons.com/fair/index.jsp
School Book Fairs Limited: