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have you called local pottery stores yet? I get most of my supplies from Seattle Pottery here. They do not have WED clay but they do have water clay in bulk. Maybe they could order you some Ultracal 30. Here a 50lb. bag is about 15-20 dollars. For the latex try
Cementex Latex Corp. | Manufacturer of Mold Making Supplies
Are you making masks?

 

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I know Marjon Ceramics in Tucson has hydrocal and hydrostone. They don't carry ultracal 30 but I am sure if you asked they could get it for you. Your gravedigger sounds like a fun prop to build. Kepp us updated on the progress.