I was aware of the Proalloy one. The only local source seems to be inokinetic. Are there other domestic sources? Interesting thought with the Vintage air unit. I may explore that some. Thought with so many folks pulling their AC for track duty there might be a used Lotus OEM rattling around in a garage somewhere.
I am sure any other domestic sources would have similar pricing to Shinoo, I mean, it is just math...
Problem with used ones is time and effort to put a 15 year old part on the car, mine didn't leak but it looked like hell.
Good point with the age issue. Agreed, why spend all the effort to put in an old part that may fail in a few months so I have to do it all over again. It just chaps my ass when an OEM part is dramatically more than it should be. I may explore your vintage air find.