Before I read this thread.. no. I once rode a horse known for a bucking problem. She never bucked for me and I'd just school her w/t English. Well one time the lady that owned her wanted me to canter her. I told her I didn't know how but she got all upset. Well minute I "asked" she threw 3 good bucks, slammed on the brakes, I went flying over her head and landed square on my head. Yes I wore a helmet, but I sprained my neck and was terrified of horses for a good 2 months.
I wish no one to experience that, so I'm careful when I've heard horses bucking.
My horse and I were green and green and no matter what he has never bucked for me.
It depends on the horse but honestly if you're looking to save money then I just don't think that's a good plan. Better to spend a little more for a finished or at least safer horse, than save some pennies and get a lot of injuries.