There are many others nearby also. A look through the yellow pages (either on-line or on paper) will connect you with others.
Also several trap clubs in the area will combine orders from their members and other trapshooters, to become part of a club order when they order a truck load of clay pigeons. This will offer a potential savings to the individual buying shot, primers, powder, wads, or flats of factory ammo.
To find out about the clubs, use the contact info for clubs from the web page listed below. Go to the club locater link for info about contacts and locations