The following sources have the largest selections. The links take you to their sites.
Barclay Press serves the Friends Church through the publication of books, pamphlets, curriculum, and periodicals of interest to evangelical Friends.
Britain Yearly Meeting Quaker Bookshop
has a large stock of Quaker books published in Britain and from around the world together with books on spirituality, liberal Christianity, social responsibility, conflict resolution and peace work.
Pendle Hill Bookstore carries a wide selection of Quaker-related titles, located at Pendle Hill, a Quaker Center for Study and Contemplation near Philadelphia.
QuakerBooks of FGC carries hundreds of titles of interest to Friends and seekers; FGC is a Quaker organization in the unprogrammed tradition of the Religious Society of Friends.
Quaker Book Service (No Web site) P 0 Box 4652, Station E Ottawa Ontario KIS 5H8 Canada
Quaker Hill Bookstore , The Friends United Meeting Bookstore is no longer in operation.