The next bumkin sale at Crawford Ne or Martin SD is about as good a place as anywhere. You just have to wear out pickups. I'd befriend a local horse swapper, and get his help. Horse swappers are a problem, by the time they know enough to help you, they seem to want to snide you.

Ike Sankey grew up by Wichita Ks. He may stand a stud that can help because his bucking progeny are rank. Ike ain't a real benevolent sort however.