p.1 #8 · Need a +0.50 screw in diopter for my Fe/Fe2
Fact of the matter is that eBay is by far the best place to find accessories like what you’re looking for, partly because so much of that stuff is sold in Japan and a lot of those sellers are active on eBay. I don’t like eBay anymore either, but that doesn’t mean it’s not the best resource in this case.