I had this question a while ago, looking for the Vigor wax wire in individual sizes, and especially wax bezels in individual sizes. I have so many assortment boxes with just the sizes remaining that I never use. Hagstoz dug up some individual size boxes from old stock, but as far as I know Vigor currently only makes assortments. I ended up with Grobet wax wire and bezels, which with some effort you can find in individual sizes. I’m not that thrilled with it, since it is considerably softer and weaker than Vigor, but hey, you use what you can get. As for stiff wax wire, I would also love to find some. I have used the Matt gun to extrude half round wire, and that is sort of okay, but not really consistent in size.