I don't recall where they all come from but I have the Minifigs stagecoach and some FreiKorps Yellow Ribbon ones as well, four in total. And I have some additional items on order that I will be converting into the much more common, like 3 or 4 to 1, mud wagons - and a couple of other 'surprise' conversions.
As I have oft said, HO doesn't work very well for 15 mm and the photo above is ample evidence of why I feel that way. Animals, sometimes, people, not so much. Bluemoon isn't the largest of 15 mm figures (or 15/18 mm) but they are close and the HO figures tower above them. They are, however, very nice figures.