There are at least around 50-60 more copies of Vol I available from New Day Publishers. All in newsprint only, though (and the paper's a wee bit yellowed. ok, a great deal yellowed, but hey, they've been sitting in storage for more than 30 years, so...)
Hey those are great finds, 'grats. I consider myself a big Skinny fan, too. A great commander from the old school cavalry, and by all indications, a good man.
I was able to get one copy of Vol 1 from them. Shipping was more expensive than the book's cost. It's 8.75" x 5.75," 214 pages, newsprint. As I mentioned earlier though, the pages aren't newish by any means; they've already yellowed, but still very readable.