Braille

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

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