1) Look at registered breeding programs. Certain breeds, like the American Quarter Horse, are known for their bucking abilities and have registered breeding programs that can help you find a horse with the right genetics for bucking.
2) Visit local rodeos and horse shows. This is a great way to see horses bucking in person and talk to the owners about their horses. You may even be able to find a horse for sale at one of these events.
3) Search online for horses for sale. Many online classifieds websites list horses for sale, and some of these horses may be specifically bred for bucking.
4) Contact a horse trainer or breeder. Horse trainers and breeders may know of horses that are available for sale that have a good bucking potential.
5) Talk to other horse enthusiasts. If you know other people who are interested in horses, they may be able to put you in touch with someone who is selling a horse that is into bucking.