My Black Limbertwig is the one of the trees that got moved with a backhoe because of a new road coming through. On top of that, after it got moved I had a rodent to gnaw 70% of the bark surface area at groundline. The tree is still alive, but it put out no new growth last season. I have two other small ones started, but they are too small at this time to get scion wood from.
If you don't find it anywhere else, check with me next year. I might be able to provide some by that time.
I will say that I've never grown a finer apple tree (in all respects) than Black Limbertwig. It flat hurt to have this much bad luck with my favorite tree.