Unfortunately, they do not offer volume discounts.
I am currently working with a detail parts manufacturer to get these done in lost wax castings, and that should bring all of that to a moot point.
One thing that Shapeways does offer is printing these and then creating a wax master for us, again saving us time and costs.
But, because of the fine wall thicknesses (0.030"), Shapeways limits the choice of materials to "ultra" detail and finer, so they charge a $5 setup fee, in addition to the per-volume material charge. This is why I'm striving to both cut down on material usage and include a multi-up design.
In this case, the design work is "free". 
You and John are leading the pack with blurring the line between 3RS & 2R, and are adored for it and both of your modeling skills. Thank you.
