I buy the regular beech tenons in their bulk packs by the quantity of 500 to 1800 depending on the size. I can, of course, make them on the table saw and the router table with a round over bit from scraps (oak, walnut, cherry or sepele, my go-to lumber). But my interest lies in furniture and cabinetmaking, and that's where I want most of my shop time spent on, not on making tenons.
However, if I only needed the Sipo just once or twice, I'd hesitate in spending $100 on it, seeing, say, 90% of its stock collecting dust in the next 10 years. In that case, I'd be willing to make my own rot-resistant tenons from, for instance, walnut or white oak scrap. Or I may just take my chance with the "epoxy-soaked" beech dominoes! [tongue]
However, if I only needed the Sipo just once or twice, I'd hesitate in spending $100 on it, seeing, say, 90% of its stock collecting dust in the next 10 years. In that case, I'd be willing to make my own rot-resistant tenons from, for instance, walnut or white oak scrap. Or I may just take my chance with the "epoxy-soaked" beech dominoes! [tongue]