I thought about sourcing these alone (or making them), because I have all of the other components to make up the bleed kit, including the syringes, barbed luer fittings DOT 5 fluid. However, when it came right down to it, I would spend a lot more than $29 worth of my time on the lathe drilling a hole through the screw lengthwise, turning the relief for the o-ring on the threaded end and cutting barbs on the other end. I searched for it, but I think it is a custom fitting made for Avid.
I spent the $29 and just bought the complete kit.