Purchased a couple of years ago and my eyes don't allow me to tie my own fly fishing flies anymore. Besides standard for fly tying it is a medium weight standard thread in the upholstery industry.
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10,000 yds is a lifetime supply. For a years worth of classes the Guides, only barely dented a roll. In the screen shot I added it shows 200 yards for $3.20, 4 oz (3,000 yds) for $29.95. This cone for sale is at least 3 of those.
Photos are of the actual black fly tying thread for sale.
I'm near Walgreens [12th & Montana], but can meet anywhere here in Helena MT 59601