I've got some on order that I think will do the trick. I'll post when I can track down the part numbers. They are listed on an American distributors web page, but I think they might be coming from overseas.
I work for a company that manufactures turbine meters and I have planned on buying a few March pumps to automate some of my process. Have yet to get there but I can definately help in sizing the meter and maybe dig up a demo unit for you. Send me a PM with some approximate flow rates and I'll see what I can find. By the way I am NOT a salesman, I am a service tech.