I don't have one that I know of, but personally, I don't think you should get or buy one of those. From two images you've attached, the left one is basically old male's body, not necessarily skinny though, they're just old. And on the right, it's not skinny, it's anorexic. If you're somehow based your artwork on the left body type, they won't look skinny, they will just look old. If you're based your artwork on the left body type, they won't look skinny either, they will look anorexic. It may sound harsh, but I genuinely believe there's a lot of healthy skinny male models out there, not unlike both of the attached photo examples. Try visit PoseSpace, or Croquis Cafe, they offer a great range of models, both males and females, which some of them look skinny but also healthy enough you shouldn't worry about their well being.