Hi everyone, I've decided to start learning uncial to go alongside my TQ but I am having trouble finding a ductus. So far this is the only one I've found that shows examples of the strokes. I was wondering whether any of you guys have one that you could recommend, preferably one not in a book because I'm cheap.

Also, as i understand it, Uncial is all written in one case but I often see different styles of the same letter in one piece of writing, is this just an artistic choice?

And Finally, could anyone explain to me what someone would mean if they said "half-Uncial"? I've seen the phrase around and I'm not quite sure what it's meant to mean.

Sorry for the wall of text for what was a simple question.

TL;DR: Does anyone have a good Uncial ductus that they could recommend?