Shipping is whatever UPS charges, we do not add anything additional.
As mentioned, mold rubber depends on what you are molding against. As long as it isn't sulfur clay or latex, you more than likely can get away with a platinum-based silicone. We offer an easy to use one that needs no scales or special equipment (such as vacuum chambers), simply mix and pour. This is the Mold Star line:
http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1341/index.html
almost zero shrinkage as well.
We do have a distributor in your area:
Eastern Burlap & Trading Co.
834 W. 25th Street
Norfolk, VA 23517
(757) 622-5914
Fax: (757) 627-5920
www.easternburlap.com