Among the pottery materials, you will find hand-used materials in small packs so you can make the first steps in making ceramic or ceramic-like products.
You can even buy 2 kg of natural clay from which you can shape smaller jars, salt cellars, decorating elements by pressing them into a finished or self-made silicone mould.
Pottery materials are not only suitable for making finished products, ceramic objects.
If you build a silicone or polyurethane mould, it could serve as supporting material, a base or stressed skin. Perhaps the cheapest way is to make such elements from clay, gypsum, concrete.