Does anyone have any suggestions for companies that do investment castings given an FDM part?

For small complicated one off 5 axis parts that can't be easily machined on our mill, this seems like the way to go.

Any rough comments on how expensive it is? I would assume complexity to play only a minor role as they just dip it and pour the molten metal in so pricing would be by volume.

If I had a 5x5x5 part, what is a typical cost range not including any additional machining/finishing if I provide the FDM part?

Thanks any leads.