American Art Clay Co., Inc. (http://www.amaco.com/)
Brent Pottery Equipment
Genesis Artist Colors International
6060 Guion Road
Indianapolis, IN 46254-1222
Phone: (800) 374-1600 or (317) 244-6871 (Mon - Fri 8am - 5pm EST)
Fax: (317) 248-9300
Supplier of friendly plastic, also found at at a crafts store.

International Operations
Unit 19
Blythe Business Park
Sandon Rd.
Cresswell
Stoke-on-Trent
ST11 9RD
Phone: +(0) 1782 399219
Fax: +(0) 1782 394891

W.P. Notcutt Ltd (http://www.notcutt.co.uk/)
Homewood Farm
Newark Lane
Ripley
Surrey GU23 6DJ
Phone: +44 01483 223311 (09:00 hrs - 17:00 hrs Monday-Friday)
Fax: +44 01483 479594

Reynolds Advanced Materials (http://www.reynoldsam.com/)
2131 South Harwood St.
Dallas, TX 75215
Phone: (800)421-4378 or (214)421-4377
Fax: (214)421-5726
Has three more locations in Houston, TX, Orlando, FL, and North Hollywood, CA.

Rubber Mold Compounds and Plastics Technology (http://www.rubbermoldcompounds.com/)
Nicholas J. Sarra
142 Oak Brook Commons
Clifton Park, NY 12065
Phone/Fax: 518-373-2843

San Diego Plastics, Inc. (http://www.sdplastics.com/)
2220 McKinley Ave
National City, CA 91950
Phone: (800)925-4855 or (619)477-4855
Fax: (619)477-4874
They have delrin in rods and sheets. One customer says that if you order long rods from them, they will cut the rods unless you tell them not to do so. For example, 8 foot rods will be cut in half.

Silpak, Inc. (http://www.silpak.com/)
470 East Bonita Ave
Pomona, CA 91767
Phone: (909)625-0056
Fax: (909)625-0082

Smooth-On (http://www.smoothon.com/)
2000 Saint John Street
Easton, PA 18042
Phone: (610) 252-5800 or (800) 762-0744
Fax: (610) 252-6200
Site is a bit script-happy…

Synair Corporation (http://www.synair.com/)
PO Box 5269
2003 Amnicola Highway
Chattanooga, TN 37406
Phone: (423) 697-0400 or (800) 251-7642
Fax: (423) 697-0424

Tap Plastics (http://www.tapplastics.com/)
5757 Pacific Avenue
Stockton, CA 95207
Phone: 1.800.246.5055 or 209.957.2036 (Mon-Fri 8-6 PST)
Fax: 1.209.957.0177
Their site has listings of other store locations, also found in the phone book. They also have delrin.