I regularly see used BSF taps and dies at my local fleamarket, for quite reasonable prices. They are used, of course, but for thread chasing and low-frequency use they are just fine. I have a set of UNC and UNF ones I acquired this way. I also see them at car swap meets where there is usually a bigger selection too.
Must say I agree wholeheartedly with the sentiments about McMaster-Carr and their rather insular attitude.
Steve.
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