Jim, you don't say what pump you have. If it's a PBS one, Paul vander Heyden is the one to talk to. If it's an A112 one, I have seen many of the A112 pumps for sale on ebay, mostly in Italy. I just looked and see prices in the 30-40 Euro range. Otherwise Obert probably has or can get pumps or parts for them.
Gil Nicholls