I love American bison and try to eat bison burgers and steak as much as possible to reward the ranchers who choose to raise them over cows.
Other than that, I know Steven Rinella listed a few pure herds in his (excellent) book [2] on the American Buffalo, but I'd have to dig it out to find them for you.
[1] https://www.youtube.com/watch?v=jzyMrBUys90
[2] https://www.amazon.com/American-Buffalo-Search-Lost-Icon/dp/...
ETA: https://www.nps.gov/articles/000/wind-cave-bison-genetics.ht...
"Wind Cave and Yellowstone National Parks are the only two federal herds to have population sizes large enough for sufficient testing. Both herds show no evidence of cattle introgression."
So there are at least two