Jerry,
Self publish through Amazon. They will sell them for you and print individual copies as required. More expensive per book than a traditional publisher but it's a way to get niche books out to people who would like them. I've got a friend who has published several books of railroad stories in a 6" X 9" format with B&W photos which he sells for $18.95. Another has done a number of 8" X 10" books, full color, which he retails for $25.95 at 110 pages and $49.95 at 275 pages. These are all soft cover but image quality is excellent. He sells to dealers at a 40% discount so his costs are clearly less than 1/2 of his retail price. Look into it. I know you have several books that you have been working on which don't seem to be coming to market.
Michael Allen