Braille Bookstore
Large selection of books for children and adults. Also offers quick reference cheatsheets.
http://www.braillebookstore.com/

Louis Braille Center
Features biographies of Louis Braille, resources for learning braille, the writings of Helen Keller, books of wisdom and inspiration, poetry, and books for children.
http://www.louisbraillecenter.org/

Seedlings Braille Books for Children
Offers childrens books. Includes information on special projects, FAQs and related resources.
http://www.seedlings.org/

Triangle Braille Services
Producer of gay and lesbian books in braille.
http://www.trianglebraille.org/

Valley Braille, Inc.
Transcriber of books, menus, sheet music, maps and math. Also offers a large inventory of Braille publications.
http://www.valleybraille.com/