Crayola Jumbo (So-Big) original formula crayons are generally available through Crayola.com, Toys R Us, Target, Michael's, Meijer and educational supply stores.
Check your local yellow pages under “school supplies” for a store near you or contact the following:
Blick Art Materials (800) 447-8192 or on-line at http://www.dickblick.com
Nasco Arts & Crafts (800) 558-9595 or on-line at http://www.enasco.com
Paper People (877) 985-7877 or on-line at http://www.thepaperpeople.com
Art Supply Wholesale (800) 462-2420 or on-line at http://allartsupplies.com