I've been buying these 100 at a time from McMaster-Carrfor a $1.90 each. I'm starting to use them up quick enough that I'd like to see if buying 250 - 500 might find me a better price somewhere. I've checked obvious places like Amazon, MSC, Carr-Lane, and EBAY. Essentra has nearly nothing. Zoro's website is about worthless when you search for something they don't even have and get 6000+ results. I used Google's site search and most of Zoro's stuff was more than twice the price. 1/4-20 female insert phenolic handles. I don't want the ones MSC has that have a formed thread. I want one with a female insert.
They get used on lead, tin, and pewter casting molds, so I don't really want to get away from the modest heat handling of phenolic. My local screw vendor doesn't have them. I asked.
Last time I looked around McMaster had the best price, but I was only buying20 at a time then. Maybe they still do.