Well, it's official. I emailed CMC today re: the EDM hammers and sears, and received the following reply:
"Thanks for your interest in Chip McCormick Corp. products. I am sorry to say that the edm parts have been discontinued a number of years ago. With Metal Injection Molding we were able to hold the tolerance and the material is as strong a forging with less the cost."
We can agree to disagree on the net result of MIM, but that's pretty much it for their excellent EDM line. I guess Brownell's has been selling from an enormous backstock of those parts and finally ran out. FWIW, I had excellent results with the Chip parts in at least 5 guns. I'll have to start searching for some new favorite components.