J&G has stainless ones for $1.95. Got some with my M38 and they work fine. They have little cutout spring strips on both sides, at both ends. They have the little arrow-in-a-triangle armory mark, so I think they're the real thing. They're not listed on the web site, though, you'd probably have to give J&G a call at 928-445-9650.
I could pick some up and mail them out, if anybody wants-- the store's about a mile from home. Wouldn't be a problem.
No fair buying them all, now; I still want a few more. ;-)
A.