The rapid prototype guys I work with (http://www.spectrumplasticsgroup.com...ithography-sla) will do castings from 1-10, 100, 1000, or anything in between using RTV molds of SLA parts and lots of choices of casting resin.

They have other options for part counts above 1000. But we don't need that. I have a great relationship with these guys, so if you have any questions, just let me know.