As of 2015, the following list of Craftsman/Atlas suppliers was known. Additions (or subtractions) if known, would be welcome. Email Tony@lathes.co.uk

Online ordering from the Sears Web Page at http://sears.com

Screwcutting changewheels for these lathes can be obtained from:
Clausing Corp. Service Centre, 811 Eisenhower, Goshen IN 46526  Phone: (219) 533-0371

For new chucks with the 1/2" x 20 thread fitting:
Sherline Products, 170 Navajo Street, San Marcos CA92069  Phone: (800) 541-0735

Three inch 3-jaw chucks with the correct thread are also available from:
Leavitt Machine Company, PO Box 270, Orange MA 01364 Phone: (508) 544-2751

The following individuals may also be making, or have available, parts for these lathes:
J.C.Boegman, 1464 South Warner Drive, Apache Junction AZ 85220 Phone: (480) 982-8436 (ask for John)
chucks for the AA (1/2" x -20tpi); newly manufactured lead screws; AA cross-slide modified to accept the engagement lever and the replaceable double-nuts from Atlas lathe. 

Thanks to Jim Anderson, who used to work for Double A Products, for helping with this information about suppliers.  He can be contacted at:
1642 Hillridge Blvd. Ann Arbor MI 48103, USA