Can anyone recommend a good BULK 3D printing service?

[EagleSeven]

I think it would be best to Mold them instead of 3D-printing, in mass production.
If you really want detailed scale figures?
3D technology is not as advanced as molding , Yet.
I suppose it depends on how detailed and accurate you want them to be ?

3D printing is a slow process compared to molding also.

You can use 3D printed figures to make Molds from though,
but will require a lot of work to get them ready, smooth and accurate condition.