I need some of these too. Home Depot, Lowes, etc - no one sells these that I can find. The acorn style from Spruce are completely different but will work. I like the originals, but $30 each is ridiculous. I went with acorn nuts (they are plastic) for like $2.50 each (which is also outrageous).
I am not sure how easy it would be to cut down a panel nut like that - pretty tiny!
