Operating a foundry is a bit of a trick. One might look for local art foundries. In California
they're are several. Very interesting work. And not too expensive. The hardest part is making the master, which must be a bit oversize to account for shrinkage. From that the foundry can readily make the rubber mold
, wax investments, and casting molds. At one time I used to do many bronze parts
. I think most art is cast in Silicon Bronze because little defects can be easily welded in that alloy. But the foundries offered other alloys too.