The Cranmer abacus can be purchased from the American Printing House for the Blind (APH). This company has several related products including the EZeeCount Abacus, the beginner's abacus and the expanded beginner's abacus and a DVD titled "Hands-On Experiences with the Cranmer Abacus." Several instructional books are also available from APH.
Hadley School for the Blind offers two courses to learn abacus computation: Abacus 1 and Abacus 2.
The following instructional resources can help teachers and others learn different abacus computation methods.
Davidow, M. E. (1988). The abacus made easy. Louisville, KY: American Printing House for the Blind.
Livingston, R. (1997). Use of the Cranmer abacus. Austin: Texas School for the Blind and Visually Impaired.
Millaway, S. M. (1994). Abacus basic competency: A counting method. Louisville, KY: American Printing House for the Blind.
Willoughby, D. M., & Duffy, S. L. (1989). Handbook for itinerant and resource teachers of blind and visually impaired students. Baltimore, MD: National Federation of the Blind.